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How many ways are there to rearrange the letters of STOP, so that no letter remains in the same place?

 Jun 28, 2020
 #1
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If I undestand your question, then there are 9 such arrangements as follows:

 

STOP:  [{O, P, S, T} , {O, P, T, S} , {O, S, P, T}, {P, O, S, T}, {P, O, T, S} , {P, S, T, O} , {T, O, P, S}, {T, P, S, O}, {T, S, P, O} ]

 
 Jun 28, 2020

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