Question

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 2013.

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

3!+11+13 is the answer that gives the sum 30