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How many words can be formed …

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How many words can be formed from the letter of the word series with start with s and end with s
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Devil Pandit ? 7 years, 4 months ago

Firstly fix s in starting and s in the end i.e. s,_,_,_,_,s. So no. Of ways are 4! Then s can also change its position by 2! ways. So no. of ways are 4!/2! .
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