PPT: Number Series-Coding and Decoding and Odd Man Out | Quantitative Aptitude for CA Foundation PDF Download

 Page 1


Number Series, 
Coding, Decoding 
and Odd Man Out 
Series
Page 2


Number Series, 
Coding, Decoding 
and Odd Man Out 
Series
Series
Number Series
Sequences of numbers following specific mathematical patterns. These 
may involve arithmetic progressions, geometric progressions, or other 
mathematical relationships between consecutive terms.
Alphabet Series
Sequences of letters following specific patterns based on their positions 
in the alphabet. These may involve forward or backward movements, 
skipping letters, or other relationships between consecutive terms.
Series questions test your ability to recognize patterns and apply logical 
reasoning to identify missing elements or continue sequences. Mastering 
these concepts requires practice and a methodical approach to pattern 
recognition.
Page 3


Number Series, 
Coding, Decoding 
and Odd Man Out 
Series
Series
Number Series
Sequences of numbers following specific mathematical patterns. These 
may involve arithmetic progressions, geometric progressions, or other 
mathematical relationships between consecutive terms.
Alphabet Series
Sequences of letters following specific patterns based on their positions 
in the alphabet. These may involve forward or backward movements, 
skipping letters, or other relationships between consecutive terms.
Series questions test your ability to recognize patterns and apply logical 
reasoning to identify missing elements or continue sequences. Mastering 
these concepts requires practice and a methodical approach to pattern 
recognition.
Number Series
1
Missing Terms
In these questions, you need to 
identify missing terms in a 
sequence by recognizing the 
underlying pattern or rule 
governing the series.
2
Pattern Recognition
Success depends on your ability 
to detect specific patterns, which 
may involve addition, subtraction, 
multiplication, division, or 
combinations of these 
operations.
3
Methodical Approach
Examine the differences between consecutive terms, look for squares, 
cubes, or other mathematical relationships to determine the rule governing 
the series.
When approaching number series problems, always check for common patterns 
like arithmetic progressions (constant difference), geometric progressions 
(constant ratio), or alternating patterns that might involve multiple rules.
Page 4


Number Series, 
Coding, Decoding 
and Odd Man Out 
Series
Series
Number Series
Sequences of numbers following specific mathematical patterns. These 
may involve arithmetic progressions, geometric progressions, or other 
mathematical relationships between consecutive terms.
Alphabet Series
Sequences of letters following specific patterns based on their positions 
in the alphabet. These may involve forward or backward movements, 
skipping letters, or other relationships between consecutive terms.
Series questions test your ability to recognize patterns and apply logical 
reasoning to identify missing elements or continue sequences. Mastering 
these concepts requires practice and a methodical approach to pattern 
recognition.
Number Series
1
Missing Terms
In these questions, you need to 
identify missing terms in a 
sequence by recognizing the 
underlying pattern or rule 
governing the series.
2
Pattern Recognition
Success depends on your ability 
to detect specific patterns, which 
may involve addition, subtraction, 
multiplication, division, or 
combinations of these 
operations.
3
Methodical Approach
Examine the differences between consecutive terms, look for squares, 
cubes, or other mathematical relationships to determine the rule governing 
the series.
When approaching number series problems, always check for common patterns 
like arithmetic progressions (constant difference), geometric progressions 
(constant ratio), or alternating patterns that might involve multiple rules.
Example 1: Find the missing term of the series 2, 7, 16, 
_____ , 46, 67, 92
2
First Term
7
Second Term
16
Third Term
29
Missing Term
Looking at the differences between consecutive terms:
7 - 2 = 5
16 - 7 = 9
The pattern shows that each difference increases by 4: +5, +9, +13, +17, +21, +25...
Therefore, the missing term = 16 + 13 = 29
Page 5


Number Series, 
Coding, Decoding 
and Odd Man Out 
Series
Series
Number Series
Sequences of numbers following specific mathematical patterns. These 
may involve arithmetic progressions, geometric progressions, or other 
mathematical relationships between consecutive terms.
Alphabet Series
Sequences of letters following specific patterns based on their positions 
in the alphabet. These may involve forward or backward movements, 
skipping letters, or other relationships between consecutive terms.
Series questions test your ability to recognize patterns and apply logical 
reasoning to identify missing elements or continue sequences. Mastering 
these concepts requires practice and a methodical approach to pattern 
recognition.
Number Series
1
Missing Terms
In these questions, you need to 
identify missing terms in a 
sequence by recognizing the 
underlying pattern or rule 
governing the series.
2
Pattern Recognition
Success depends on your ability 
to detect specific patterns, which 
may involve addition, subtraction, 
multiplication, division, or 
combinations of these 
operations.
3
Methodical Approach
Examine the differences between consecutive terms, look for squares, 
cubes, or other mathematical relationships to determine the rule governing 
the series.
When approaching number series problems, always check for common patterns 
like arithmetic progressions (constant difference), geometric progressions 
(constant ratio), or alternating patterns that might involve multiple rules.
Example 1: Find the missing term of the series 2, 7, 16, 
_____ , 46, 67, 92
2
First Term
7
Second Term
16
Third Term
29
Missing Term
Looking at the differences between consecutive terms:
7 - 2 = 5
16 - 7 = 9
The pattern shows that each difference increases by 4: +5, +9, +13, +17, +21, +25...
Therefore, the missing term = 16 + 13 = 29
Alphabet Series
Pattern Recognition
Alphabet series involve letters 
arranged in specific patterns. 
Success depends on identifying the 
rule governing the sequence.
Position-Based
Many patterns rely on the position of 
letters in the alphabet (A=1, B=2, etc.) 
and mathematical operations on these 
positions.
Multiple Rules
Some series may have different rules 
for different positions within each 
term of the sequence.
The English alphabet consists of 26 letters with specific positions as shown in the image. Understanding these positions 
is crucial for solving alphabet series problems effectively.