38
The ordered pair $(5,2)$ belongs to the relation $$R=\{(x, y): y=x-5, x, y \in Z\}$$
A
TRUE
B
FALSE
39
If $P=\{1,2\}$, then $P \times P \times P=\{(1,1,1),(2,2,2),(1,2,2),(2,1,1)\}$
A
TRUE
B
FALSE
40
$\begin{aligned} & \text { If } A=\{1,2,3\}, B=\{3,4\} \text { and } C=\{4,5,6\} \text {, then }(A \times B) \cup(A \times C) \\ & =\{(1,3),(1,4),(1,5),(1,6),(2,3),(2,4),(2,5),(2,6),(3,3) \text {, } \\ & (3,4),(3,5),(3,6)\} .\end{aligned}$
A
TRUE
B
FALSE
41
If $$(x - 2,y + 5) = \left( { - 2,{1 \over 3}} \right)$$ are two equ8al ordered pairs, then $$x = 4,y = {{ - 14} \over 3}$$
A
TRUE
B
FALSE
42
If $A \times B=\{(a, x),(a, y),(b, x),(b, y)\}$, then $A=\{a, b\}$ and $B=\{x, y\}$
A
TRUE
B
FALSE