Multiple choice

Directions: In the following number series, one number is wrong. Find out the odd number.

3, 7, 15, 27, 63, 127, 255

  1. 7

  2. 15

  3. 27

  4. 63

  5. 127
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sequence is (Number × 2) + 1 = Next number.

 (3 × 2) + 1 = 7; (7 × 2) + 1 = 15; (15 × 2) + 1 = 31; (31 × 2) + 1 = 63; (63 × 2) + 1 = 127;  (127 × 2) + 1 = 255. 27 is the odd one out.

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