# Permutations and Combinations · Mathematics · AP EAPCET

Start Practice## MCQ (Single Correct Answer)

AP EAPCET 2022 - 4th July Morning Shift

The total number of permutations of $$n$$ different things taken not more than $$r$$ at a time, when each thing may be repeated any number of times is...

AP EAPCET 2022 - 4th July Morning Shift

How many chords can be drawn through 21 points on a circle?

AP EAPCET 2022 - 4th July Morning Shift

If a polygon of $$n$$ sides has 560 diagonals, then $$n=$$

AP EAPCET 2022 - 4th July Morning Shift

A person writes letters to 6 friends and addresses the corresponding envelopes. In how many ways can the letters be placed in the envelopes so that at...

AP EAPCET 2021 - 20th August Morning Shift

The value of $${ }^6 P_4+4 \cdot{ }^6 P_3$$ is

AP EAPCET 2021 - 20th August Morning Shift

The number of ways in which 3 boys and
2 girls can sit on a bench so that no two boys
are adjacent is

AP EAPCET 2021 - 20th August Morning Shift

In how many ways can 5 balls be placed in
4 tins if any number of balls can be placed in
any tin?

AP EAPCET 2021 - 19th August Evening Shift

For $$1 \leq r \leq n, \frac{1}{r+1}\left\{{ }^n P_{r+1}-{ }^{(n-1)} P_{r+1}\right\}$$ is equal to

AP EAPCET 2021 - 19th August Evening Shift

In how many ways 4 balls can be picked from
6 black and 4 green coloured balls such that
at least one black ball is selected?

AP EAPCET 2021 - 19th August Evening Shift

In how many ways can 9 examination papers
be arranged so, that the best and the worst
papers are never together?

AP EAPCET 2021 - 19th August Morning Shift

If a person has 3 coins of different denominations, the number of different sums can be formed is

AP EAPCET 2021 - 19th August Morning Shift

There are 7 identical white balls and 3 identical black balls. The number of distinguishable arrangements in a row of all the balls, so that no two bl...

AP EAPCET 2021 - 19th August Morning Shift

The number of ways of distributing eight identical rings to three different girls so that every girl gets at least one ring is

AP EAPCET 2021 - 19th August Morning Shift

If the letters of the word REGULATIONS be
arranged in such a way that relative positions
of the letters of the word GULATIONS
remain the same, then th...