Question

A perfect number is defined as a number whose sum of all divisions (except the number itself ) is same as the number itself. Mark all the perfect numbers in the options given below.

Answer 1

Answer:

Step-by-step explanation:

Lets check each option one by one

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