Question 1184223
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<pre>

In this problem, instead of 4 objects, we consider 4-1 = 3 objects,


looking at the pair SQ as one unit.



For 3 objects, we have 3! = 6 possible permutations;

therefore, the answer to the problem's question is  3! = 6.
</pre>

Solved and explained.



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Hello, &nbsp;the previous solution was done assuming that speaker &nbsp;Q  &nbsp;addresses &nbsp;IMMEDIATELY &nbsp;after speaker &nbsp;S.


If the problem means &nbsp;" after, &nbsp;but not necessary immediately after ", &nbsp;then the answer is  &nbsp;&nbsp;{{{(1/2)*4!}}} = {{{24/2}}} = 12:


In half of &nbsp;4! = 24 permutations, &nbsp;Q &nbsp;follows &nbsp;S; &nbsp;in other half of permutations, &nbsp;S &nbsp;follows &nbsp;Q.