Question

_+_+_+=30
with the sum of 3,7,5,9,11,13,15

Answer 1

Odd numbers don't add up to give you an even number.
It is possible only in case of factorial.

3! + 15 + 9 = 30

Answer 2

15+9+3!=30
otherwise it won't correct.
because sum of two odd number will be an even number.even number+odd number=odd number..But 30 is not a odd number