Question

using  these numbers 1,3,5,7,9,11,13,15, solve this = 30 days. You can repeat these numbers.
You need to fill the numbers in 5 spaces given below.

------ + ------ + ------- + --------- + -------- = 30 days

Answer 1

it is not possible because adding odd digits any odd number of times will never result in an even number.

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.