Good Things Take Time

Statements-I:: The no. of permutations of n different things taken any no. of things at a time is nP_n, (repetition not allowed) Statements-II : The no. of permutations of n different things taken any no. of things at a time is nP_1+nP_2 +nP_3+ +nP_n (repetition not allowed)

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

I. There is a complaint against him that he _________ the mistakes of his juniors. II. A good thing about this house is that it _________ the sea.

The number of permutations of n things taken r at a time if 3 particular things always occur is

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