Problems Based on Combination and Permutation
Category : JEE Main & Advanced
(1) Problems based on combination or selection : To solve such kind of problems, we use \[^{n}{{C}_{r}}=\frac{n\,!}{r!(n-r)!}\].
(2) Problems based on permutation or arrangement : To solve such kind of problems, we use \[^{n}{{P}_{r}}=\frac{n\,!}{(n-r)!}\].
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