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Use counting to determine the whole number that corresponds to the cardinality of these sets. (a) a = {x|x ∈ n and 17 < x ≤ 23}, (b) b = {x|x ∈ n and x − 5 = x}, (c) c = {x|x ∈ n and (x − 88) (x −22) = 0} , (d) d = {x|x ∈ n, 1 ≤ x ≤ 100 and x is divisible by both 77 and 22} n(A)=
Sagot :
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