The number of permutations of 25 dissimilar things taken more than 15 at a time when repetitions are allowed is (not exceeding 25)

The number of circular permutations of 7 dissimilar things taken 5 at a time is

The number of permutation of n different objects, taken r at a line, when repetitions are allowed, is …….. .

The number of permutation of n different objects, taken r at a line, when repetitions are allowed, is …….. .

The number of permutations of n different objects, taken r at a line, when repetitions are allowed, is ……

The number of permulations of n different objects taken K at a time , when repetitions are allowed is

Show that the total number of permutations of n diferent things not more than r things at a time (repetition being allowed) is (n(n^(r)-1))/(n-1) .

The number of circular permutations of 8 things taken 4 at a time is

The number of circular permutations of 8 things taken 4 at a time is

2.The number of permutations of 8 things taken at a time is 1680, Then r=