Question

Solve this..
◻➕◻➕◻➕◻➕◻=30 days

Fill the boxes using (1, 3, 5, 7, 9, 11, 13, 15)

Answer 1

it is not possible because adding odd digits any odd 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.