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Number Series - Questions and Answers

Practice questions on Number Series.

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6. 3, 128, 6, 64, 9, ��., 12, 16, 15, 8
A. 32
B. 12
C. 108
D. 72
E. 64
Explanation: ANSWER : 32 Explanation : . There are two alternate series � one, 3, 6, 9, 12,15 and the other 8, 16, 32, 64, 128 (every number is double of preceding number). Hence, the missing number will be 32.
7. 4, 7, 11, 18, 29, 47, �., 123, 199
A. 76
B. 70
C. 84
D. 102
E. 95
Explanation: ANSWER : 76 Explanation : . 3rd number is the sum of 1st and 2nd, 4th number is the sum of 2nd and 3rd, 5th number is the sum of 3rd and 4th and so on. Hence, missing number will be 29 + 47 = 76
8. 8, 4, 12, 6, 18, ���.., 27
A. 10
B. 12
C. 18
D. 24
E. None of these
Explanation: ANSWER : None of these Explanation : . 3rd, 5th and 7th numbers are the sums of preceding two numbers. Hence, the missing number is 9 as 18 + 9 = 27.
9. 45, 54, 47, ��., 49, 56, 51, 57, 53
A. 48
B. 55
C. 50
D. 53
E. None of these
Explanation: ANSWER : 55 Explanation : . There are two alternate series in the single series, one of them moves with a difference of one number starting with 45, and another is a consecutive series starting with 54. Hence, the missing number will be 55
10. 2, 6, 12, 20, �.., 42, 56, 72, 90
A. 20
B. 21
C. 30
D. 12
E. 23
Explanation: ANSWER : 30 Explanation : . Series moves with the increasing difference by 2 i.e., 4, 6, 8, 10, 12�.. Therefore, the missing number will be 30.
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