. If A={4n + 21 n is a natural number} and B={3n|n
is a natural number), then what is (An B) equal to?
(a) {12n2 + 6n|n is a natural number} (NDA 2011)
(b) {24n - 12|n is a natural number}
(c) {12n2 - 6n|n is a natural number
(d) {12n - 6 n is a natural number
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