Solved

A) No
B) Yes

Question 9

Multiple Choice

 In the system shown, is the operation commutative? ∗qrstqtsrqrsqtrsrtqstqrst\begin{array}{l}\text { In the system shown, is the operation commutative? }\\\begin{array} { l | l l l l } * & q & r & s & t \\\hline q & t & s & r & q \\r & s & q & t & r \\s & r & t & q & s \\t & q & r & s & t\end{array}\end{array}


A) No
B) Yes

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