Multiple choice

In the following series, find which of the given numbers is wrong and does not follow the pattern: 21 105 525 2615 13125 65625

  1. 13125

  2. 525

  3. 65625

  4. 2615

  5. 105
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The series follows a pattern of multiplying by 5: 21*5=105, 105*5=525, 525*5=2625, 2625*5=13125, 13125*5=65625. The number 2615 is incorrect because it should be 2625.

AI explanation

The pattern multiplies each number by 5, as seen in 21 times 5 = 105 and 105 times 5 = 525. Following this rule, 525 times 5 gives 2625, which means 2615 is the incorrect term.

Keep practicing — related questions