Permutations and Combinations
Interactive practice questions
Evaluate $\binom{6}{5}$(65).
Easy
1min
Evaluate $\binom{14}{1}$(141).
Easy
1min
How many terms does the expansion of $\left(9x+6y\right)^8$(9x+6y)8 have?
Easy
< 1min
The $3$3rd row of Pascal’s triangle contains the elements $1$1, $3$3, $3$3, $1$1. Each of these can be rewritten in $\nCr{n}{r}$nCr form: $\nCr{3}{0}$3C0, $\nCr{3}{1}$3C1, $\nCr{3}{2}$3C2, $\nCr{3}{3}$3C3.
Rewrite each element of the $5$5th row of Pascal’s triangle as an $\nCr{n}{r}$nCr coefficient.
Easy
2min
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