Multiple choice

Directions: Select the missing number from the given series. 3, 7, 13, 27, 53, ?

  1. 107

  2. 111

  3. 109

  4. 105
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is: 3*2+1=7, 7*2-1=13, 13*2+1=27, 27*2-1=53, 53*2+1=107.

AI explanation

The series follows a pattern where each term is multiplied by 2 and then alternately subtracts and adds 1. Multiplying 3 by 2 and adding 1 gives 7, multiplying 7 by 2 and subtracting 1 gives 13, and multiplying 13 by 2 and adding 1 gives 27. Following this alternating pattern, we multiply 53 by 2 and add 1 to get 107. The result is 107.

Keep practicing — related questions