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SSC MTS 2024 · PYQ · Number Series · medium

What should come in place of the question mark (?) in the following series? 3, 7, 15, 31, 63, ?

  1. A.168
  2. B.576
  3. C.127✓ Correct
  4. D.177

Explanation

Each term is obtained by multiplying the previous term by 2 and adding 1 (3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63, 63×2+1=127).
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