Find the total number of permutations of `n` different things taken not more than `r` at a time, when each thing may be repeated any number of times.

Show that the total number of permutations of n different things takenn not more than r at a time, when each thing may be repated any number of times is (n(n^(r)-1))/((n-1)) .

Total number of permutations of k different things, in a row, taken not more than r at a time (each thing may be repeated any number of times) is equal to Options: 1.k^r -1 2. k^r 3.(k^r-1)/(k-1) 4.k(k^r-1)/k-1

What is the total number of combination of n different things taken 1, 2, 3,...,n at a time ?

Find the number of permutations of n different things taken r at a time such that two specific things occur together?