Question

IF m,n ARE NATURAL NUMBERS, FOR WHAT VALUES OF m, DOES 2^n*5^n ENDS IN 5?​

Answer 1

Step-by-step explanation:

2n is always even for all values of n. 5m is always odd and ends with 5 for all values of m. But 2n × 5m is always even and ends in 0. ∴ 2n × 5m cannot end with the digit 5 for any values of m.