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Question

The number of six letter words that can be formed using the letters of the word "ASSIST" in which S's alternate with other letters is


A

12

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B

24

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C

18

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D

None of these

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Solution

The correct option is A

12


All S's can be placed either at even places or at odd places, i.e, in 2 ways.

The remaining letters can be placed at the remaining places in 3!, i.e. in 6 ways.

Total number of ways =6×2=12


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