WBCS.LIVE practice question

What comes next in the sequence 1, 3, 7, 15, 31, 63, ________?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 127
  2. 125
  3. 121
  4. 129

Correct answer and explanation

Correct answer: 127

Explanation: āœ… Correct Answer: A) 127 šŸ“š Explanation: The sequence follows a pattern where each term is the (previous number multiplied by 2) plus 1. Specifically: (1x2)+1=3, (3x2)+1=7, (7x2)+1=15, (15x2)+1=31, (31x2)+1=63. Following this rule, the next term is (63 multiplied by 2) plus 1, which equals 126 + 1 = 127. This geometric progression is a very common feature in mental ability series.