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Choose the correct alternative from the given ones that will complete the series:‐

5, 11, 21, 43, 85, ?


1. 185
2. 170
3. 171
4. 181

1 Answer

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Best answer
Correct Answer - Option 3 : 171

5

5 × 2 + 1 = 11

11 × 2 - 1 = 21

21 × 2 + 1 = 43

43 × 2 - 1 = 85

85 × 2 + 1 = 171

∴ 171 is the correct answer

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