Question

Addition of 5 odd numbers=30

Answer 1

NO it is impossible .
for eg.
 sum of any 2 odd no. is even (3+7=10,5+11=16)
and sum of even and odd no is odd (3+2=5.8+9=17)
 so it is not possible to get 30 by adding 5 odd nos.

Answer 2

i)   3!+1+3+13+7=30              [ If we solve by factorial method]
ii)   3!+3!+3!+3!+3!=30
     [3!=3×2×1=6]

[without factorial method]
Odd nos added for odd nos. of time will always give an ODD NUMBER.
Odd nos added for even no of time will give an EVEN NUMBER.