Question

()+()+()+()+()=30
Solve this 30 fill the boxes using 1 3 5 7 9 11 13 15 u can also repeat the numbers this question came in upsc final exams held in dec 13 solve

Answer 1

3!+3!+3!+3!+3!=30

Note that 3*2*1=6

Answer 2

Gaurav Agrawal answered very intelligently and using his imagination.         -- really for this question is asked so many times.. all credit goes to him.  I believe his answer was:
             3! + 3! + 3! + 3! + 3!      = 30 

you can answer this question in many ways using the factorial function.

   3! + 1 + 3 + 9 + 11          = 30
       1 + 5 + 7 + 3! + 11               = 30
             3! + 3! + 3! + 11 + 1             = 30
                 3! + 3! + 11 + 5 + 1               = 30
            11+ 1 + 1 + 3! + 11              = 30
       15 + 3 + 3 + 3 + 3!              = 30
     13 + 1 + 1 + 9 + 3!            = 30
         13 + 1 + 3 + 7 + 3!            = 30
               13 + 5 + 3 + 3 + 3!            = 30

======================================================
You need one operator for which the result is an even number with an input being an odd number.  Factorial is one.  Probably there are other operators too.