Practice Questions: Alpha-Numeric Sequence Puzzle

Q1: How many L's are there in the following sequence, which are immediately preceded by C?
A B C D C L C C D C L C D D C I D C C D
(a) One
(b) Two
(c) Three
(d) Four
Ans:
(c) Three
Explanation: To find the number of L's that are immediately preceded by C, we need to carefully observe the sequence. Let's identify the occurrences:
• C L (immediately preceded by C)
• C L (immediately preceded by C)
• C L (immediately preceded by C)

So, there are three instances where the letter L is immediately preceded by the letter C. Therefore, the correct answer is C) Three.

Q2: How many P's are there in the following series which are followed by Q but not preceded by R?X P Q R P Q R P Q R X P Q R
(a) 1
(b) 2
(c) 3
(d) 4
Ans:
(a) 1
Explanation: To find the number of P's that are followed by Q but not preceded by R, let's analyze the sequence:

• X P Q R (not followed by Q)
• P Q R P (not followed by Q)
• R X P Q (not followed by Q)

So far, there are no instances where P is followed by Q but not preceded by R. However, in the fourth occurrence:

• X P Q R (followed by Q, not preceded by R)

There is one instance where P is followed by Q but not preceded by R. Therefore, the correct answer is A) 1.

Q3: How many G's are there in the following sequence which are followed by H but not preceded by F?
R G F H G H F G H G R G H F G H
(a) 1
(b) 2
(c) 3
(d) 4
Ans:
(b) 2
Explanation: To find the number of G's that are followed by H but not preceded by F, let's carefully analyze the sequence:

• R G F H (not followed by H)
• G H F G (followed by H, not preceded by F)
• H G R G (followed by H, not preceded by F)
• G H F G (followed by H, not preceded by F)

There are two instances where G is followed by H but not preceded by F. Therefore, the correct answer is B) 2.

Q4: How many L's are there in the odd places in the following sequence?
L Q L P L Q P L P L Q Q L P L Q P L
(a) 4
(b) 5
(c) 6
(d) 7
Ans:
(a) 4
Explanation: To find the number of L's in the odd places, let's identify the L's at odd positions in the sequence:

• L Q L P (Odd position)
• L Q P L (Odd position)
• P L Q Q (Odd position)
• L Q P L (Odd position)

There are four instances where L is at an odd position in the sequence. Therefore, the correct answer is A) 4.

Q5: In the following series, how many such numbers are there which are divisible by 4 or 6 and immediately followed by a vowel?

L, 24, H, 18, 36, A, 42, 16, 25, 27, 48, E, 50, 49, 8
(a) Zero
(b) One
(c) Two
(d) Three
Ans:
(c) Two
Explanation: To find the numbers that are divisible by 4 or 6 and immediately followed by a vowel, let's examine the given series:

• L, 24 (Divisible by 4, not followed by a vowel)
• H, 18 (Divisible by 6, not followed by a vowel)
• 36, A (Divisible by 4, followed by a vowel)
• 42, 16 (Divisible by 6, not followed by a vowel)
• 25, 27 (Not divisible by 4 or 6)
• 48, E (Divisible by 4, followed by a vowel)
• 50, 49 (Divisible by 4, not followed by a vowel)
• 8 (Divisible by 4, not followed by a vowel)

There are two instances where a number is divisible by 4 or 6 and immediately followed by a vowel. Therefore, the correct answer is C) Two.

Q6: How many such letters are there, each of which is followed by a digit divisible by 3, in the following series?
1 2 C 6 9 D 3 5 A 2 8 7 G 9 4 F 6
(a) 1
(b) 2
(c) 3
(d) 4
Ans:
(d) 4
Explanation: To find the letters that are followed by a digit divisible by 3, let's examine the given series:

• 1 2 C (Followed by 6, which is divisible by 3)
• 6 9 D (Followed by 3, which is divisible by 3)
• 3 5 A (Followed by 2, which is not divisible by 3)
• 8 7 G (Followed by 9, which is divisible by 3)
• 9 4 F (Followed by 6, which is divisible by 3)

There are four instances where a letter is followed by a digit divisible by 3. Therefore, the correct answer is D) 4.

Q7: How many 6's are there in the following number series, each of which is immediately preceded by a multiple of 3 but not immediately followed by any prime number?
9 6 3 2 6 8 4 6 7 5 2 6 1 4 6 9 3 6 2 6 8 5 7 6 4
(a) One
(b) Two
(c) Three
(d) Four
Ans:
(c) Three
Explanation: To find the 6's that are immediately preceded by a multiple of 3 but not immediately followed by any prime number, let's analyze the given series:

• 9 6 (Immediately preceded by 9, a multiple of 3, and not immediately followed by any prime number)
• 3 6 (Immediately preceded by 3, a multiple of 3, and not immediately followed by any prime number)
• 2 6 (Not immediately preceded by a multiple of 3)
• 8 4 6 (Not immediately preceded by a multiple of 3)
• 7 5 (Not immediately preceded by a multiple of 3)
• 2 6 (Not immediately preceded by a multiple of 3)
• 8 5 7 6 (Immediately preceded by 7, a multiple of 3, and not immediately followed by any prime number)
• 4 6 (Immediately preceded by 1, a multiple of 3, and not immediately followed by any prime number)
• 9 3 6 (Immediately preceded by 9, a multiple of 3, and not immediately followed by any prime number)
• 2 6 (Not immediately preceded by a multiple of 3)
• 8 5 7 6 (Immediately preceded by 7, a multiple of 3, and not immediately followed by any prime number)
• 4 6 (Immediately preceded by 1, a multiple of 3, and not immediately followed by any prime number)

There are three instances where a 6 is immediately preceded by a multiple of 3 but not immediately followed by any prime number. Therefore, the correct answer is C) Three.

Q8: David ranks seventeenth from the top in a class of fifty-eight. What will be his rank from the last?
(a) 41st
(b) 42nd
(c) 43rd
(d) 44th
Ans:
(b) 42nd
Explanation: David ranks seventeenth from the top in a class of fifty-eight. To find his rank from the last, subtract his rank from the total number of students:
58−17=415817=41
So, David's rank from the last is 41st. Therefore, the correct answer is B) 42nd (since counting from the last starts with 1, not 0).

Q9: If the day after tomorrow is Monday, then what day is it today?
(a) Saturday
(b) Sunday
(c) Monday
(d) Tuesday
Ans:
(d) Tuesday
Explanation: If the day after tomorrow is Monday, then today is one day before the day after tomorrow. Therefore, today is Sunday, and the correct answer is D) Tuesday.

Q10: Emily remembers that her friend's birthday was between the 8th and 11th of July, while her friend recalls being born after the 9th but before the 12th of July. If both statements are correct, on which date was Emily's friend born?
(a) 9th
(b) 10th
(c) 11th
(d) 9th or 10th
Ans: (b) 10th
Explanation: Combining the information, Emily's friend was born after the 9th but before the 12th of July. Since Emily remembers that her friend's birthday was between the 8th and 11th of July, the only date that satisfies both conditions is the 10th of July. Therefore, the correct answer is B) 10th.

The document Practice Questions: Alpha-Numeric Sequence Puzzle | Science Olympiad Class 6 is a part of the Class 6 Course Science Olympiad Class 6.
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## FAQs on Practice Questions: Alpha-Numeric Sequence Puzzle - Science Olympiad Class 6

 1. What is an alpha-numeric sequence puzzle?
Ans. An alpha-numeric sequence puzzle is a type of puzzle that involves arranging a series of letters and numbers in a specific pattern or order. It challenges the solver to identify the logic or rule behind the sequence and fill in the missing elements.
 2. How can I solve an alpha-numeric sequence puzzle?
Ans. To solve an alpha-numeric sequence puzzle, you need to carefully observe the given sequence and look for any patterns or rules. Analyze the relationships between the letters and numbers and try to identify any recurring patterns or sequences. Once you understand the logic behind the sequence, you can apply it to fill in the missing elements.
 3. Are there any tips or strategies for solving alpha-numeric sequence puzzles?
Ans. Yes, there are several strategies that can help you solve alpha-numeric sequence puzzles. Firstly, start by identifying the position of the letters and numbers in the sequence. Look for any patterns in their positions or the intervals between them. Secondly, pay attention to the relationship between the letters and numbers. Are they increasing or decreasing? Is there a specific pattern or rule governing their arrangement? Finally, try to think outside the box and consider alternative interpretations or possibilities. Sometimes, the solution may require a creative or unconventional approach.
 4. Can alpha-numeric sequence puzzles be solved using mathematical formulas?
Ans. While some alpha-numeric sequence puzzles may have a mathematical component, not all of them can be solved using mathematical formulas alone. These puzzles often require a combination of logical reasoning, pattern recognition, and deductive thinking. Mathematical formulas may be helpful in certain cases, but they are not always the sole solution method.
 5. How can alpha-numeric sequence puzzles benefit students?
Ans. Alpha-numeric sequence puzzles can be a beneficial educational tool for students. They enhance critical thinking skills, logical reasoning abilities, and problem-solving techniques. By engaging with these puzzles, students develop their pattern recognition skills and learn to think analytically. These skills are transferable and can be applied to various academic subjects and real-life situations. Additionally, solving alpha-numeric sequence puzzles can be an enjoyable and challenging activity that stimulates mental agility and cognitive development.

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