Question

_+_+_=30 using 1,3,5,7,9,11,13,15

Answer 1

Solution :-

We must know , Sum of odd number's doesn't give resulting answer  an even number. 

Ex :- 

$3 + 5 = 8$

Where , 8 is an even numbers !

Therefore , Here we apply Factorial Method to find out the solution !!

⇒ $3! + 11 + 13 = 30$                                                                → ( Answer )

⇒ Here , 3 ! means - 1 × 2 ×3 = 6 ...

Answer 2

The sum of three odd numbers gives an odd number
So, the sum of 3 given odd numbers doesn’t results 30
So, it is an impossible factor
here we can't use 3! too
because 3! [3×2×1] results a even number 6
so we can’t use it.
If there will be an allowance of factorials, then the answers will be
3! + 15 + 9 =30
3! + 11 + 13 = 30