Find out the missing number in the series. 3, 5, 9, 17, 33, ?
Question and options
Find out the missing number in the series.
3, 5, 9, 17, 33, ?
- 65
- 66
- 57
- 55
Answer and explanation
Correct answer: A - 65
Each term is twice the previous one minus 1: 3 × 2 − 1 = 5, 5 × 2 − 1 = 9, 9 × 2 − 1 = 17 and 17 × 2 − 1 = 33. The next term is 33 × 2 − 1 = 65; equally, the differences 2, 4, 8 and 16 double each time, giving 33 + 32 = 65.
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CUSAT CAT Five-Year LL.B.
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