Permutations and Combinations · Mathematics · AP EAPCET

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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...
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