In how many ways can a team of $11$ members be formed from a group of $15$ persons?

Choose the correct number of ways in which $15$ different books can be divided into five heaps of equal number of books.

How many words comprising of any three letters of the word $UNIVERSAL$ can be formed?

Total number of $3$ letter words that can be formed from the letters of the word $'SAHARANPUR'$ is equal to

$3$ boys $B_1, B_2, B_3$ and $6$ girls $G_1, G_2, . . . , G_6$ are to be seated in a row. The number of ways they can be seated such that $B_1, B_2$ are separated and $G_1, G_2$ are also separated is equal to:

If $n$ is a factor of $72$,such that $xy = n$,then the number of ordered pairs $(x, y)$ is: (where $x, y \in N$)