Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
11.
7, 26, 63, 124, 215, 342, ?
A. 391 B. 421
C. 481 D. 511
Answer & Explanation
Answer: Option D
Explanation:
The terms of the given series are (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1),…..
So, missing term = (83 – 1) = (512 – 1) = 511.
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12.
3, 12,27,48, 75, 108,?
A. 147 B. 162
C. 183 D. 192
Answer & Explanation
Answer: Option A
Explanation:
The terms of the given series are 3 x l2, 3 x 22, 3 x 32, 3 x 42, 3 x 52, 3 x 62,…..
So, missing term = 3 x 72 = 3 x 49 = 147.
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13.
3, 7, 23, 95, ?
A. 62 B. 128
C. 479 D. 575
Answer & Explanation
Answer: Option C
Explanation:
The pattern is x 2 + 1, x 3 + 2, x 4 + 3,…..
So, missing term = 95 x 5 + 4 = 479.
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14.
6, 18, 3, 21, 7, 56, ?
A. 8 B. 9
C. 63 D. 64
Answer & Explanation
Answer: Option A
Explanation:
Each term at an even place in the series is the product of its two adjacent terms.
Thus, if the missing term be x, then we have : 7 x x = 56 or x = 56 ÷ 7 = 8.
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15.
4, 9, 25, ?, 121, 169, 289, 361
A. 49 B. 64
C. 81 D. 87
Answer & Explanation
Answer: Option A
Explanation:
The given series consists of squares of consecutive prime numbers
i.e. 22, 32, 52,…..,
11, 132, 172, 192.
So, missing term = 72 = 49.