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Series Test Practice Set

25. 251 (12) 107
381 (?) 125
A. 14
B. 24
C. 11
D. 16

Answer: Option D
Explanation: 251 – 107 = 144 = (12)2
→ 381 – 125 = 256 = (16)2
Hence, 16 is the missing number in the given question.

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DIRECTIONS (Qs. 26-30): In each of the following number series, a wrong number is given. Find out that number.

दिशानिर्देश (प्रश्न 26-30): निम्नलिखित प्रश्नों में एक श्रृंखला दी गयी है जिसमें एक गलत संख्या दी गयी है। उस संख्या का पता लगाएं।

26. 10 15 24 35 54 75 100
A. 35
B. 75
C. 24
D. 15

Answer: Option A
Explanation:The series is +5, +9, +13, +17 …. The difference in successive nos. 9 – 5 = 13 – 9 = 17 – 13 = …. = 4. Hence, 35 is wrong. It should be 37.

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27. 1 3 4 7 11 18 27 47
A. 27
B. 11
C. 18
D. 7

Answer: Option A
Explanation:The sum of the first two nos. is the third no. Hence, 27 is wrong. It should be 29.

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28. 3 2 3 6 12 37.5 115.5
A. 37.5
B. 12
C. 6
D. 2

Answer: Option B
Explanation:The series is × 0.5 + 0.5, × 1 + 1, × 1.5 + 1.5 …. Hence, 12 is wrong. It should be 14.

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29. 2 8 32 148 765 4626 32431
A. 765
B. 148
C. 8
D. 32

Answer: Option D
Explanation:The series is × 2 + 22, × 3 + 32, × 4 + 42, × 5 + 52 …..
Hence, 32 is wrong. It should be 33.

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30. 2 3 11 38 102 229 443
A. 11
B. 229
C. 120
D. 38

Answer: Option B
Explanation:The series is + l3, + 23, + 33, + 43 ….. Hence, 229 is
wrong. It should be 227.

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