Multiple choice

Find the wrong term in the given series. 3, 7, 15, 31, 64, 127

  1. 64

  2. 15

  3. 127

  4. 7

  5. 31
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Find the pattern: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63, 63×2+1=127. The pattern is multiply by 2 and add 1. Following this: 31×2+1=63, but we have 64. So 64 is the wrong term (should be 63). All other terms follow the n×2+1 pattern correctly.

Keep practicing — related questions