In the system shown, is there an identity for the operation?
$\begin{array}{l|llll}
* & q & r & s & t \
\hline q & t & s & r & q \
r & s & q & t & r \
s & r & t & q & s \
t & q & r & s & t
\end{array}$

A) Yes, $s$ is the identity.
B) No, there is no identity.
C) Yes, $r$ is the identity.
D) Yes, $q$ is the identity.
E) Yes, $t$ is the identity.

Question

In the system shown, is there an identity for the operation?
$\begin{array}{l|llll}
* & q & r & s & t \
\hline q & t & s & r & q \
r & s & q & t & r \
s & r & t & q & s \
t & q & r & s & t
\end{array}$

A) Yes, $s$ is the identity.
B) No, there is no identity.
C) Yes, $r$ is the identity.
D) Yes, $q$ is the identity.
E) Yes, $t$ is the identity.

Quizplus · Accepted Answer

The Answer of In the system shown, is there an identity for the operation?
$\begin{array}{l|llll}
* & q & r & s & t \
\hline q & t & s & r & q \
r & s & q & t & r \
s & r & t & q & s \
t & q & r & s & t
\end{array}$

A) Yes, $s$ is the identity.
B) No, there is no identity.
C) Yes, $r$ is the identity.
D) Yes, $q$ is the identity.
E) Yes, $t$ is the identity.

In the System Shown, Is There an Identity for the Operation