$($a$).$ Let $(2,4,7,8\}.$ Fill in the blanks by $C$ or $$ to make

$3$

the resulting statements true.

$($a$)$ B $q,$ A

$($b$)$ C $q,$ A

$($c$)$ B $q,$ C

$($d$)\frac{O}{?}q,$ B

$($e$)$ C $q,$ C

$($f$)$ C $q,$ B

$($b$).$ Identify the cardinality of the below given sets:

$($i$)A=\{1,1,2,3,3,3\}$

$3$

$($ii$)B=\{10,\{20,53\},\{14,45\},62\}$

$($iii$)C=\frac{O}{?}$

$($iv$)D=\{nN|x999\}$

$($v$)E=\{xinN|x1\}$

$($vi$)$ BU$,$ BUET, BAUET, BUBT, BU$,$ BUP