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Question

Select the perfect number(s) from the following?



Correct Answer
A

whose sum of all its factors is equal to twice the number.

Correct Answer
B

27

Your Answer
C

whose sum of all its factors is equal to thrice the number.

Your Answer
D

none of these


Solution

The correct options are
A

whose sum of all its factors is equal to twice the number.


B

27


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

6 is a perfect number since the sum of its factors 1, 2, 3 and 6 is 12 i.e. twice of 6.
28 is a perfect number since the sum of its factors 1,2,4,7,14 and 28 is 56 ie. twice of 28

                   

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