Use counting to determine the whole number that corresponds to the cardinality of these sets. (a) C = {x|x E N and (x-3)(x-8)=0}

Question

Use counting to determine the whole number that corresponds to the cardinality of these sets.
(a) C = {x|x E N and (x-3)(x-8)=0}
(b) D= (xx EN, 1 sxs 100 and x is divisible by both 4 and 9)
(a) n(C) =

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