Answer :

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 !!
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

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