List of top Mathematics Questions on permutations and combinations asked in AP EAPCET

In how many ways can the letters of the word “MULTIPLE” be arranged keeping the position of the vowels fixed?
If a set $A$ has $m$ elements and the set $B$ has $n$ elements, then the number of injections from $A$ to $B$ is
If \( ^nC_{r-1} = 36 \), \( ^nC_r = 84 \), and \( ^nC_{r+1} = 126 \), then the value of \( nr^2 \) is:
How many chords can be drawn through 21 points on a circle?