A number 'n' is said to be perfect,  if the sum of all its divisors( excluding n itself)  is equal to 'n'. An example of perfect number is  - Study24x7
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A number "n" is said to be perfect,  if the sum of all its divisors( excluding n itself)  is equal to "n". An example of perfect number is 

A

9

B

15

C

21

D

6

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