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Question Number 80340 by Rio Michael last updated on 02/Feb/20

$$\mathrm{If}P=\left(\begin{array}{cccc}a& b& c& d\\ c& d& a& b\end{array}\right),Q=\left(\begin{array}{cccc}a& b& c& d\\ b& a& d& c\end{array}\right)\mathrm{are}$$$$\mathrm{permutations}\mathrm{of}\mathrm{the}\mathrm{elements}(a,b,c,d),\mathrm{then}$$$$QP\equiv$$$$$$

Answered by MJS last updated on 02/Feb/20

$$\mathrm{if}QP\mathrm{means}\mathrm{first}Q\mathrm{then}P$$$$a\to b\to d$$$$b\to a\to c$$$$c\to d\to b$$$$d\to c\to a$$$$QP=\left(\begin{array}{cccc}a& b& c& d\\ d& c& b& a\end{array}\right)$$

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