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Permutation: n Different Things Taken All at a Time When All Are Not Different.

Find the numb...

Question

Find the number of permutations that can be made with the letters of the word $^{'} R E A R^{'}$ ?

A

4!

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B

\frac{4!}{2!}

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C

2! \times 2!

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D

none of these

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Solution

The correct option is B $\frac{4!}{2!}$
In word "REAR" , two $R$ are repeated.
Therefore , total number of ways $= \frac{4!}{2!}$

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Permutation: n Different Things Taken All at a Time When All Are Not Different.

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