Alphanumeric Series, Introduction and Examples (with Solutions) - 2 | Reasoning Aptitude for Competitive Examinations - Bank Exams PDF Download

Here are the alphanumeric series practice questions with their answers and explanations:

Type 1: Completing the Series

1. Identify the missing element:

Series: A, C, E, G, __

Options: a) H b) I c) J d) K

Answer: b) I

Solution: The given series consists of alternating letters in the English alphabet:

• A (1st letter)
• C (3rd letter)
• E (5th letter)
• G (7th letter)

The next letter will be the 9th letter in the alphabet, which is I

2. Identify the missing element:

Series: 1A, 2B, 3C, 4D, __

Options: a) 5E b) 5D c) 6D d) 5F

Answer: a) 5E

Solution: We observe two patterns:

1. Numbers: The numbers start at 1 and increase by 1 in each term:

   • $1,2,3,4,...1,\; 2,\; 3,\; 4,\; ...$ So the next number will be 5.

2. Letters: The letters start at $A$A and follow the alphabetical order:

   • $A,\; B,\; C,\; D,\; ...$A,B,C,D,...So the next letter will be E (the letter after D).

Combining Both: The next term will be 5E.

3. Identify the missing element:

Series: Z1, Y2, X3, __

Options: a) W4 b) V4 c) W5 d) U4

Answer: a) W4

Solution: 

• Z,Y,X,...
• The next letter will be W (the letter before X).
  The numbers increase sequentially:
  • 1,2,3,...
    The next number will be 4.

Combining Both: The next term in the series is W4.

4. Identify the missing element:

Series: M2, P4, S6, V8, __

Options: a) Y10  b) X10  c) Y12  d) Z10

Answer: a) Y10

Solution: 

• The letters increase alphabetically, skipping two letters each time:
  • M,P,S,V,...
    The next letter after $V$V is Y
• The numbers increase by 2:
  • 2,4,6,8,...
    The next number is 10.

Combining Both: The next term in the series is Y10.

5. Identify the missing element:

Series: 5X, 7V, 9T, 11R, __

Options: a) 13Q b) 13P c) 13S d) 13N

Answer: b) 13P

Solution: 
The numbers increase by 2 in each step:

• 5,7,9,11,...
  The next number is 13.
• The letters decrease in reverse alphabetical order, skipping one letter each time:
  • X,V,T,R,...
    The next letter is P (the letter before $R$R).

Combining Both: The next term in the series is 13P.

• The letters increase alphabetically, skipping two letters each time:
  • B→E→H→K→...
    The next letter after K is N.

• The numbers increase by $3$3:
  • 3,6,9,12,...
    The next number is 15.
• The letters increase alphabetically, skipping two letters each time:
  • $\mathrm{<br\; style="word-break:\; break-word;\; line-height:\; 1.8;\; font-family:\; Lato,\; sans-serif;\; font-size:\; 20px;\; letter-spacing:\; inherit;\; color:\; black;">}F\; \backslash rightarrow\; I\; \backslash rightarrow\; L\; \backslash rightarrow\; O\; \backslash rightarrow\; ...$F→I→L→O→...
    The next letter is R.

Combining Both: The next term in the series is 15R.

• The numbers increase by 2:
  • 2,4,6,8,...
    The next number is 10.
• The letters decrease in reverse alphabetical order, skipping one letter each time:
  • Z→X→V→T→...
    The next letter is R (the letter before $T$T).

Combining Both: The next term in the series is 10R.

• The letters increase alphabetically, skipping two letters each time:
  • $D\; \backslash rightarrow\; G\; \backslash rightarrow\; J\; \backslash rightarrow\; M\; \backslash rightarrow\; ...$D→G→J→M→...
    The next letter is P.
• The numbers increase by $3$3:
  • 4,7,10,13,...
    The next number is 16.

Combining Both: The next term in the series is P16.

• The numbers increase by $\mathrm{<span\; style="background-color:\; transparent;\; word-break:\; break-word;\; line-height:\; 1.8;\; font-family:\; Lato,\; sans-serif;\; letter-spacing:\; inherit;\; font-size:\; 20px;">10:</span>}$
  • 10, 20, 30, 40,...
    The next number is 50.
• The letters increase alphabetically, skipping one letter each time:
  • $\mathrm{<br\; style="word-break:\; break-word;\; line-height:\; 1.8;\; font-family:\; Lato,\; sans-serif;\; font-size:\; 20px;\; letter-spacing:\; inherit;\; color:\; black;">}B\; \backslash rightarrow\; D\; \backslash rightarrow\; F\; \backslash rightarrow\; H\; \backslash rightarrow\; ...$B→D→F→H→... The next letter is J.

Combining Both: The next term in the series is 50J.

Type 2: Finding the Pattern

1. Identify the pattern:

   • Series: 2A, 4D, 6G, 8J, __
   • Options: a) 10K b) 10L c) 10M d) 10N
   • Answer: c) 10M
   • Solution: 
     The numbers increase by $\mathrm{<br\; style="word-break:\; break-word;\; line-height:\; 1.8;\; font-family:\; Lato,\; sans-serif;\; font-size:\; 20px;\; letter-spacing:\; inherit;\; color:\; black;">}2$2:
     2,4,6,8,...
     The next number is 10.
     The letters increase alphabetically, skipping two letters each time:
     $A\; \backslash rightarrow\; D\; \backslash rightarrow\; G\; \backslash rightarrow\; J\; \backslash rightarrow\; ...$A→D→G→J→...
     The next letter is M.
     Combining Both: The next term in the series is 10M.

2. Identify the pattern:

   • Series: B1, D2, F3, H4, __
   • Options: a) J5 b) J6 c) I5 d) K5
   • Answer: a) J5
   • Solution: 
     1. The letters increase alphabetically, skipping one letter each time:
        B→D→F→H→...
        The next letter is J.
     2. The numbers increase sequentially:
        1,2,3,4,...
        The next number is 5.

3. Combining Both: The next term in the series is J5.

4. Identify the pattern:

   • Series: T20, R18, P16, N14, __
   • Options: a) L12 b) M12 c) K12 d) L10
   • Answer: a) L12
   • Solution: 
     • The letters decrease in reverse alphabetical order, skipping one letter each time:
       T→R→P→N→...
       The next letter is L.

   • The numbers decrease by $22$2:
     20,18,16,14,...
     The next number is 12.

   • Combining Both: The next term in the series is L12.

5. Identify the pattern:

   • Series: 3C, 6F, 9I, 12L, __
   • Options: a) 15N b) 15M c) 15O d) 15P
   • Answer: c) 15O
   • Solution: The numbers are increasing by 3 and the letters by 3 (C + 3 = F, F + 3 = I, I + 3 = L, L + 3 = O).

6. Identify the pattern:

   • Series: X5, V10, T15, R20, __
   • Options: a) P25 b) Q25 c) N25 d) O25
   • Answer: a) P25
   • Solution: The letters are decreasing by 2 and the numbers by 5 (X - 2 = V, V - 2 = T, T - 2 = R, R - 2 = P and 5, 10, 15, 20, 25).

7. Identify the pattern:

   Series: 4A, 7D, 10G, 13J, __
   Options:
   a) 16N
   b) 16M
   c) 16O
   d) 16P

   Answer: b) 16M

   Solution: The numbers are increasing by 3 and the letters by 3 (A + 3 = D, D + 3 = G, G + 3 = J, J + 3 = M).

8. Identify the pattern:

   Series: C1, F4, I7, L10, __
   Options:
   a) O13
   b) O12
   c) N13
   d) P10

   Answer: a) O13

   Solution: The letters are increasing by 3 and the numbers by 3 (C + 3 = F, F + 3 = I, I + 3 = L, L + 3 = O).

9. Identify the pattern:

   Series: 25T, 23R, 21P, 19N, __
   Options:
   a) 17K
   b) 18L
   c) 17L
   d) 18K

   Answer: c) 17L

   Solution: The letters are decreasing by 2 and the numbers by 2 (T - 2 = R, R - 2 = P, P - 2 = N, N - 2 = L).

10. Identify the pattern:
    Series: 5E, 10H, 15K, 20N, __
    Options:
    a) 25R
    b) 25P
    c) 25Q
    d) 25S
    Answer: c) 25Q
    Solution: The numbers are increasing by 5 and the letters by 3 (E + 3 = H, H + 3 = K, K + 3 = N, N + 3 = Q).

11. Identify the pattern:
    Series: A3, C8, E13, G18, __
    Options:
    a) I23
    b) I22
    c) H23
    d) H22
    Answer: a) I23
    Solution: The letters are increasing by 2 and the numbers by 5 (A + 2 = C, C + 2 = E, E + 2 = G, G + 2 = I). (

Type 3: Finding the Incorrect Element

1. Identify the incorrect element:

   • Series: A2, C4, E6, G8, I10, L12
   • Options: a) A2 b) C4 c) G8 d) L12
   • Answer: d) L12
   • Solution: The letters are increasing by 2 and the numbers by 2 (A + 2 = C, C + 2 = E, E + 2 = G, G + 2 = I, I + 2 = K and 2, 4, 6, 8, 10).

2. Identify the incorrect element:

   • Series: 2B, 4D, 6F, 8H, 10K
   • Options: a) 2B b) 4D c) 6F d) 10K
   • Answer: d) 10K
   • Solution: The letters are increasing by 2 and the numbers by 2 (2, 4, 6, 8, 10 and B + 2 = D, D + 2 = F, F + 2 = H, H + 2 = J).

3. Identify the incorrect element:

   • Series: Z1, X3, V5, P7, R9
   • Options: a) Z1 b) X3 c) P7 d) R9
   • Answer: C) P7
   • Solution: The letters are decreasing by 2 and the numbers are increasing by 2 (Z - 2 = X, X - 2 = V, V - 2 = T, T - 2 = R and 1, 3, 5, 7, 9).

4. Identify the incorrect element:

   • Series: B3, D6, F9, H10, J15
   • Options: a) B3 b) D6 c) H10 d) J15
   • Answer: c) H10
   • Solution: The letters are increasing by 2 and the numbers by 3 (B + 2 = D, D + 2 = F, F + 2 = H, H + 2 = J and 3, 6, 9, 12, 15).
5. Identify the incorrect element:
   Series: A3, C6, E9, G12, I18
   Options:
   a) A3
   b) C6
   c) G12
   d) I18
   Answer: d) I18
   Solution: The letters are increasing by 2 and the numbers by 3 (A + 2 = C, C + 2 = E, E + 2 = G, G + 2 = I and 3, 6, 9, 12, 15).
   
   
6. Identify the incorrect element:
   Series: 1P, 3R, 5T, 7V, 10X
   Options:
   a) 1P
   b) 5T
   c) 7V
   d) 10X
   Answer: d) 10X
   Solution: The numbers are increasing by 2 and the letters by 2 (P + 2 = R, R + 2 = T, T + 2 = V, V + 2 = X).
   
   
7. Identify the incorrect element:
   Series: Z2, X5, V9, T11, R14
   Options:
   a) Z2
   b) V9
   c) T11
   d) R14
   Answer: b) V9
   Solution: The letters are decreasing by 2 and the numbers are increasing by 3 (Z - 2 = X, X - 2 = V, V - 2 = T, T - 2 = R and 2, 5, 8, 11, 14)
   
   
8. Identify the incorrect element:
   Series: 4A, 7D, 10G, 12J, 16M
   Options:
   a) 4A
   b) 7D
   c) 12J
   d) 16M
   Answer: c) 12J
   Solution: The numbers are increasing by 3 and the letters by 3 (A + 3 = D, D + 3 = G, G + 3 = J, J + 3 = M).
   
   
9. Identify the incorrect element:
   Series: 3B, 6E, 9F, 12K, 15N
   Options:
   a) 3B
   b) 9F
   c) 12K
   d) 15N
   Answer: b) 9F
   Solution: The numbers are increasing by 3 and the letters by 3 (B + 3 = E, E + 3 = H, H + 3 = K, K + 3 = N). 

Type 4: Reverse Order Series

1. Identify the next element:

   • Series: Z1, Y2, X3, __
   • Options: a) W4 b) W5 c) V4 d) U5
   • Answer: a) W4
   • Solution: The letters are decreasing by 1 and the numbers increasing by 1 (Z - 1 = Y, Y - 1 = X, X - 1 = W and 1, 2, 3, 4).

2. Identify the next element:

   • Series: 5E, 4D, 3C, 2B, __
   • Options: a) 1A b) 1B c) 0A d) 1C
   • Answer: a) 1A
   • Solution: The numbers are decreasing by 1 and the letters decreasing by 1 (5, 4, 3, 2, 1 and E - 1 = D, D - 1 = C, C - 1 = B, B - 1 = A).

3. Identify the next element:

   Series: H5, G6, F7, __
   Options:
   a) E8
   b) E7
   c) G8
   d) D8

   Answer: a) E8

   Solution: The letters are decreasing by 1 and the numbers are increasing by 1 (H - 1 = G, G - 1 = F, F - 1 = E and 5, 6, 7, 8).

4. Identify the next element:
   Series: 10J, 9I, 8H, __
   Options:
   a) 7G
   b) 7I
   c) 7J
   d) 8G
   Answer: a) 7G
   Solution: The numbers are decreasing by 1 and the letters are decreasing by 1 (10, 9, 8 and J - 1 = I, I - 1 = H, H - 1 = G).
   
   

5. Identify the next element:
   Series: S4, R5, Q6, __
   Options:
   a) P7
   b) P6
   c) S5
   d) R6
   Answer: a) P7
   Solution: The letters are decreasing by 1 and the numbers are increasing by 1 (S - 1 = R, R - 1 = Q, Q - 1 = P and 4, 5, 6, 7).
   
   

6. Identify the next element:
   Series: 3C, 2B, 1A, __
   Options:
   a) 0Z
   b) 0B
   c) 1Z
   d) 2A
   Answer: a) 0Z
   Solution: The numbers are decreasing by 1 and the letters are decreasing by 1 (3, 2, 1 and C - 1 = B, B - 1 = A, A - 1 = Z).