Question

Show that 3" x 4 cannot end with the digit 0 or 5 for any natural numbers
'n and 'mi​

Answer 1

Hey

QUESTION :- show that 3^m x 4^n cannot end with digits 0 or 5

Solution :-

3^m ends with 3 or 9 or 7 or 1

4^n ends with 4 or 6

so when add the digits it is not equal to 0 or 5

example :- 3 + 5 = 8

1 + 6 = 7

So 3^m x 4^n cannot end with 0 or 5