A perfect number is:

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A perfect number is:

Options:

A . a number whose sum of factors is equal to twice the number.

B . a number whose sum of its digits is equal to the product of its digits.

C . a number whose sum of factors is equal to thrice the number.

D . a number which is co-prime to every other number.

Answer: Option A
:
A
A perfect number is a number for which the sum of all its factors is equal to twice the number.
For example, 6 is a perfect number since the sum ofits factors 1, 2, 3 and 6 is 12 i.e. twice of 6.
Perfect numbers are also defined as those numbers that equalthe sum of all their factorsincluding 1 butexcluding the number itself.
Taking the same example of 6: sum of its factors excluding the numberitself i.e 6 = 1+2+3 = 6.

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