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Addition and Subtraction of a Matrix

The number of...

Question

The number of permutations that can be made out of the letter of the word “ENTRANCE” so that the two ‘N’ s are always together is

A

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B

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C

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D

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Solution

The correct option is C
Take two N’s as one unit. This unit and remaining 6 letters in which 2 are alike can be arranged in $\frac{7!}{2!}$

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