CLAT Exam > CLAT Questions > 3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a...
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3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57
- a)41
- b)39
- c)38
- d)43
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct...
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3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct...
3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57
Divide the given sequence into two parts taking alternate numbers
That is - 3,7,13,21,31,?,57. and 1,3,7,15,31,63
in first sequence it follows +4,+6,+8,10,+12,+14 (increasing by 2)
so the ? is 31+12 = 43
Second sequence follows
+2,+4,+8,+16,+32 (double of the previous)
Divide the given sequence into two parts taking alternate numbers
That is - 3,7,13,21,31,?,57. and 1,3,7,15,31,63
in first sequence it follows +4,+6,+8,10,+12,+14 (increasing by 2)
so the ? is 31+12 = 43
Second sequence follows
+2,+4,+8,+16,+32 (double of the previous)
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Community Answer
3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct...
The given sequence is: 3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57
To solve this sequence, we need to identify the pattern or rule that governs the numbers.
Observations:
- The pattern seems to alternate between two different sequences.
- The first sequence is 3, 7, 13, 21, 31, which is increasing by 4 each time.
- The second sequence is 1, 3, 7, 15, 31, which is increasing by doubling the previous number and adding 1 each time.
Identifying the pattern:
- The first number in the sequence, 3, belongs to the first sequence.
- The second number in the sequence, 1, belongs to the second sequence.
- The third number, 7, belongs to the first sequence.
- The fourth number, 3, belongs to the second sequence.
- The fifth number, 13, belongs to the first sequence.
- The sixth number, 7, belongs to the second sequence.
- The seventh number, 21, belongs to the first sequence.
- The eighth number, 15, belongs to the second sequence.
- The ninth number, 31, belongs to the first sequence.
- The tenth number, 31, belongs to the second sequence.
Continuing the pattern:
- We can observe that the first sequence increases by 4 each time, while the second sequence doubles the previous number and adds 1 each time.
Applying the pattern:
- To find the missing number, we need to determine which sequence it belongs to.
- The eleventh number, ?, should belong to the first sequence, as the previous number, 31, belongs to the second sequence.
- To find the eleventh number, we add 4 to the previous number in the first sequence: 31 + 4 = 35.
Final answer:
- The missing number in the sequence is 35.
- None of the given options (a) 41, (b) 39, (c) 38, (d) 43 match the correct answer, so the given options are incorrect.
To solve this sequence, we need to identify the pattern or rule that governs the numbers.
Observations:
- The pattern seems to alternate between two different sequences.
- The first sequence is 3, 7, 13, 21, 31, which is increasing by 4 each time.
- The second sequence is 1, 3, 7, 15, 31, which is increasing by doubling the previous number and adding 1 each time.
Identifying the pattern:
- The first number in the sequence, 3, belongs to the first sequence.
- The second number in the sequence, 1, belongs to the second sequence.
- The third number, 7, belongs to the first sequence.
- The fourth number, 3, belongs to the second sequence.
- The fifth number, 13, belongs to the first sequence.
- The sixth number, 7, belongs to the second sequence.
- The seventh number, 21, belongs to the first sequence.
- The eighth number, 15, belongs to the second sequence.
- The ninth number, 31, belongs to the first sequence.
- The tenth number, 31, belongs to the second sequence.
Continuing the pattern:
- We can observe that the first sequence increases by 4 each time, while the second sequence doubles the previous number and adds 1 each time.
Applying the pattern:
- To find the missing number, we need to determine which sequence it belongs to.
- The eleventh number, ?, should belong to the first sequence, as the previous number, 31, belongs to the second sequence.
- To find the eleventh number, we add 4 to the previous number in the first sequence: 31 + 4 = 35.
Final answer:
- The missing number in the sequence is 35.
- None of the given options (a) 41, (b) 39, (c) 38, (d) 43 match the correct answer, so the given options are incorrect.
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3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct answer is option 'D'. Can you explain this answer? for CLAT 2025 is part of CLAT preparation. The Question and answers have been prepared according to the CLAT exam syllabus. Information about 3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for CLAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct answer is option 'D'. Can you explain this answer?.
3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct answer is option 'D'. Can you explain this answer? for CLAT 2025 is part of CLAT preparation. The Question and answers have been prepared according to the CLAT exam syllabus. Information about 3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for CLAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 3, 1, 7, 3, 13, 7, 21, 15, 31, 31, ?, 63, 57a)41 b)39 c)38 d)43Correct answer is option 'D'. Can you explain this answer?.
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