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Question

- 9
- 15
- 21
- 6

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Solution

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A. 9 divisor are 1 and 3.

1+3=4≠9 so not a perfect number.

B. 15 divisors are 1,3, and 5.

1+3+5=9≠15 so not a perfect number

C. 21 divisors are 1, 3 and 7.

1+3+7=11≠21, so not a perfect number.

D. 6 divisors are 1,2 and 3.

1+2+3=6 It is a perfect number

So correct answer is option D

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