Multiple choice

Directions: The given number series follows a specific pattern except one number. Find out that wrong number in the series. 5, 12, 23, 36, 54

  1. 5

  2. 12

  3. 54

  4. 36

  5. 23
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pattern: 5+7=12, 12+11=23, 23+13=36, 36+17=53. The sequence of added numbers is 7, 11, 13, 17 (primes). The last term 54 should be 53.

AI explanation

The differences between the terms in the series are consecutive prime numbers. The differences are 7, 11, 13, and 18. Since 18 is not a prime number, the pattern is broken at the final step, making the correct difference 17. Adding 17 to 36 gives the correct final term of 53, which means the listed term 54 is the wrong number.

Keep practicing — related questions