Question

()+()+()=30 fill the blanks by using (1,3,5,7,9,11,12,15,17)

Answer 1

It can be solved by factorial method
3 factorial means 3x2x1=6
3 factorial+15+9
6+15+9=30

Answer 2

It is impossible to get even number by adding odd number.
It can done by factorial method  
3! +9 + 15 =30
3! = 1*2*3 = 6