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Number Series - Questions and Answers

Practice questions on Number Series.

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11. 2, 9, 23, 3, 8, 25, 4, ��, 27
A. 7
B. 29
C. 23
D. 14
E. 20
Explanation: ANSWER : 7 Explanation : . There are three alternative series 2, 3, 4 �� (consecutive numbers), 9, 8, 7 �. (consecutive number in descending order), and 23, 25, 27, � Hence, 7 will come in place of the missing number.
12. 6, 126, ��., 9, 108, 12, 7, 133, 19, 12, 72, 6
A. 21
B. 23
C. 30
D. 35
E. 40
Explanation: ANSWER : 21 Explanation : . Number between 1st and 3rd, 4th and 6th, 7th and 9th is the product of the adjacent numbers. Hence the missing number will be 126/6 = 21.
13. 2, 3, 5, 9, 17, 33, �..
A. 85
B. 37
C. 63
D. 64
E. 65
Explanation: ANSWER : 65 Explanation : . Series moves with a difference of 1, 2, 4, 8, 16, 32. Hence, the missing number is 65.
14. 6, 9, 15, 27, �.., 99
A. 51
B. 34
C. 37
D. 84
E. None of these
Explanation: ANSWER : 51 Explanation : . Series proceeds with a difference of 3, 6, 12, 24, 48, respectively. Hence, the missing number will be 51.
15. 17, 7, 24, 19, 9, 28, ��., 8, 31, 27, 10, 37
A. 20
B. 21
C. 18
D. 12
E. 23
Explanation: ANSWER : 23 Explanation : . Each 3rd number is the sum of preceding two numbers. i.e., 17 + 7 = 24, 19 + 9 = 28, 23 + 8 = 31. Hence, the missing number will be 23
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