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A perfect number among the following is

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answer is C, D.

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Detailed Solution

A number for which sum of all the factors is equal to twice of the given number is called a perfect number.

factors of 6 are $1, 2, 3, 6$

Sum of factors of $6 = 1 + 2 + 3 + 6 = 12 = 2 \times 6$

Factors of 28 are $1, 2, 4, 7, 14$ and 28

Sum of the factors of $28 = 1 + 2 + 4 + 7 + 14 + 28 = 56 = 2 \times 28$

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