The correct options are
B A number that equals the sum of its divisors, excluding the number itself
C 6 is a perfect number.
D A number that equals the sum of its factors, minus the number itself.
Perfect Number : A positive integer that is equal to sum of its divisiors, excluding the number itself.
Consider the number ′6′.
Factors of ′6′ are: 1, 2, 3, 6.
Now , on following the definition of a perfect number.
Sum of factors=1+2+3+6−6=6 (that is number itself)
∴6 is a perfect number.