Which of the following expressions given the number of permulations of 15 objects taken 5 at a time?

Find the number of permutations of 7 objects, taken 3 at a time.

Find the number of permutations of 10 objects, taken 4 at a time.

Which out of the following are expressions with numbers only? 5

Which out of the following are expressions with numbers only? v 5-5n

Which of the following expression is equivalent to 5a+10b+15c?

Which out of the following are expressions with numbers only? (f) 5-5n

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

Which out of the following are expressions with numbers only? 5(21-7)+7 xx 2

If a denotes the number of permutations of (x+2) things taken all at a time, b the number of permutations of x things taken 11 at a time and c the number of permutations of x-11 things taken all at a time such that a=182b c , find the value of xdot a) 10 b) 12 c) 15 d) 18

Number of circular permutations of 15 things taken 5 at a time in one direction is