Multiple choice

What will come in place of question mark?

1, 3, 7, 15, 31, 63, ?

  1. 95

  2. 127

  3. 128

  4. 79

  5. 71

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

As it is clear from the series, every term of the series is added to the increasing powers of 2 to get the next term.

1 + 2= 3 3 + 2= 7 7 + 2= 15 15 + 2= 31 31 + 2= 63 Similarly, 63 + 2= 127