Multiple choice

In the following number-series one number is wrong. Find out that wrong number. (2 \quad 9 \quad 5 \quad 36 \quad 125 \quad 648)

  1. 36

  2. 9

  3. 125

  4. 5

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: position^2 × (position + 1). For position 4: 4^2 × 5 = 80, but 36 is given. The correct term should be 80. 5 correctly follows the pattern (position 3: 3^2 × 4 = 36).

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