Question

Adding three odd numbers how can we get 30

Answer 1

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 !!

Answer 2

it is it is impossible to get answer in even number by adding odd number. 
But it can do by factorial method.
3! + 15 + 9 =30
3! + 11 + 13 = 30 
3! = 1*2*3 = 6