$$\begin{array}{l}
\text { Is the system shown closed under the operation? }\
\begin{array} { c | c c c c }
* & q & r & s & t \
\hline q & t & s & r & q \
r & s & q & t & r \
s & r & t & q & s \
t & q & r & s & t
\end{array}
\end{array}$$
A) No
B) Yes

Question

$$\begin{array}{l}
\text { Is the system shown closed under the operation? }\
\begin{array} { c | c c c c } 
* & q & r & s & t \
\hline q & t & s & r & q \
r & s & q & t & r \
s & r & t & q & s \
t & q & r & s & t
\end{array}
\end{array}$$
A) No
B) Yes

Quizplus · Accepted Answer

The system is closed under the operation because every operation between elements results in an element that is within the set {q, r, s, t}.

A) No B) Yes

A) No
B) Yes