Question

_ _ _=30 bt the value should be 1,3,5,7,9,11,13,15

Answer 1

Odd numbers  cannot add with even numbers .its can be possible only with factorial.
example:- 3! + 15 + 9 = 30.

Answer 2

3!+4!=(3×2×1)+(4×3×2×1)
=6+24
=30.