Multiple choice

Find the wrong term in the following number series: 20, 21, 25, 41, 105, 365

  1. 41

  2. 25

  3. 365

  4. 20
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern in differences: 21-20=1, 25-21=4, 41-25=16, 105-41=64. These are powers of 4: 4^0, 4^1, 4^2, 4^3. Continuing the pattern, next difference should be 4^4 = 256, so next term = 105 + 256 = 361. However, the given term is 365, which doesn't fit the pattern.

Keep practicing — related questions