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Multiple choice

Choose the correct alternative from given ones that will complete the series. 8, 15, 29, 57, 113, ?

  1. 227

  2. 223

  3. 225

  4. 224

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Find the pattern: 15 = 2×8 - 1 = 15; 29 = 2×15 - 1 = 29; 57 = 2×29 - 1 = 57; 113 = 2×57 - 1 = 113. The rule is: next term = 2×(previous term) - 1. Next term = 2×113 - 1 = 225.

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