Question:
Find the missing number in given series.
16, 33, 65, 131, 261, (.....)
Find the missing number in given series.
16, 33, 65, 131, 261, (.....)
16, 33, 65, 131, 261, (.....)
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Each term is obtained from the previous one by multiplying by 2 and alternately adding and subtracting 1.
Updated On: Nov 12, 2026
- 523
- 521
- 524
- 520
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The Correct Option is A
Solution and Explanation
Look at consecutive terms:
16 × 2 + 1 = 33
33 × 2 - 1 = 65
65 × 2 + 1 = 131
131 × 2 - 1 = 261
The pattern alternates +1, -1, +1, -1, so the next step is +1: 261 × 2 + 1 = 523.
Answer: (1) 523
16 × 2 + 1 = 33
33 × 2 - 1 = 65
65 × 2 + 1 = 131
131 × 2 - 1 = 261
The pattern alternates +1, -1, +1, -1, so the next step is +1: 261 × 2 + 1 = 523.
Answer: (1) 523
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