Question

__+__+__=30?
(1,3,5,7,9,11,13,15)

Answer 1

Its not possible because sum of 3 odd no. Is not even number................it can be possible when we use factorial...

Answer 2

There can be many answers but the basic idea is using factorial. Factorial is the product of all the numbers from 1 to that number. For example 4! = 1 x 2 x 3 x 4 = 24.
 
So, 3! + 11 + 13  = 30
Similarly you can find many such answers.

Hope that helps !!