There are $3$ sections in a question paper and each section contains $5$ questions. A candidate has to answer a total of $5$ questions, choosing at least one question from each section. Then the number of ways, in which the candidate can choose the questions, is
$1500$
$2255$
$3000$
$2250$
In an election there are $8$ candidates, out of which $5$ are to be choosen. If a voter may vote for any number of candidates but not greater than the number to be choosen, then in how many ways can a voter vote
The total number of three-digit numbers, with one digit repeated exactly two times, is
In how many ways can $21$ English and $19$ Hindi books be placed in a row so that no two Hindi books are together
If $^{n + 1}{C_3} = 2{\,^n}{C_2},$ then $n =$
If the number of five digit numbers with distinct digits and $2$ at the $10^{\text {th }}$ place is $336 \mathrm{k}$, then $\mathrm{k}$ is equal to