If m, n are natural numbers, for what values of m, does `2^(n)times5^(m)` ends in 5?

The A . M first 'n' natural numbers is

Consider the numbers of the form 4^n where n is a natural number. Check whether there is any value of n for which 4^n ends with zero?

The weighted A . M of first 'n' natural numbers whose weights are equal to the corresponding

If the papers of 4 students randomly đistributed for checking among 7 teachers, then the probability that all the 4 papers are checked by exactly 2 teachers is n i m where n, m are 'natural numbers and H C F(n, m)=1 . Then number of positive divisors of (n+m) is

For what values of natural number n, 4^(n) can end with the digit 6?

For what values of natural number n, 4^(n) can end with the digit 6?