Quiz

1. The number of non-empty equivalence relations on the set $\{1,2,3\}$ is:

(1) 6

(2) 7

(3) 5

(4) 4

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Correct Answer: (3) 5

2. If $A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$ , then the value of $|2A|$ is:

(1) $-4$

(2) $-8$

(3) $8$

(4) $16$

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Correct Answer: (2) $-8$