Exercise"Life is like riding a bicycle. To keep your balance you must keep moving."
- Albert Einstein
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Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
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| 11. |
3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ? |
Answer: Option E
Explanation:
The given sequence is a combination of two series : I. 3, 7, 13, 21, 31, ? and II. 4, 7, 13, 22, 34 The pattern in I is + 4, + 6, + 8, + 10,..... The pattern in II is + 3, + 6, + 9, + 12,..... So, missing term = 31 + 12 = 43.
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| 12. |
198, 194, 185, 169, ? |
Answer: Option A
Explanation:
The pattern is - 4, - 9, - 16,.....i.e. - 22, - 32, - 42,..... So, missing pattern = 169 - 52 = 169 - 25 = 144.
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| 13. |
2, 3, 5,7,11,?, 17 |
Answer: Option C
Explanation:
Clearly, the given series consists of prime numbers starting from 2. So, the missing term is the prime number after 11, which is 13.
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| 14. |
6, 12, 21, ?, 48 |
Answer: Option C
Explanation:
The pattern is + 6, + 9, + 12, + 15, ..... So, missing term = 21 + 12 = 33.
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| 15. |
Which term of the series 5, 10, 20, 40, ..... is 1280? |
Answer: Option B
Explanation:
Clearly, 5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40,..... So, the series is a G.P. in which a = 5 and r = 2. Let 1280 be the rath term of the series. Then, 5x2n-1 = 1280  2n-1 = 256 = 28 n - 1 = 8 n = 9.
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