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Choose the correct alternative that will complete the given number series.
9, 17, 31, 57, ?, 205
9, 17, 31, 57, ?, 205
- A107
- B109
- C104
- D102
Answer not set
Discussion 1
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CCommunity
⇒ 9 × 2 – 1 = 17
⇒ 17 × 2 – 3 = 34 – 3 = 31.
⇒ 31 × 2 – 5 = 62 – 5 = 57
⇒ 57 × 2 – 7 = 114 – 7 = 107
⇒ 107 × 2 – 9 = 214 – 9 = 205
Hence, 107 will complete the series.
⇒ 17 × 2 – 3 = 34 – 3 = 31.
⇒ 31 × 2 – 5 = 62 – 5 = 57
⇒ 57 × 2 – 7 = 114 – 7 = 107
⇒ 107 × 2 – 9 = 214 – 9 = 205
Hence, 107 will complete the series.