1.

Which set is infinite of the following: (A) {x : x ∈ N and (x – 1)(x – 2) = 0} (B) {x : x ∈ N and x2 = 4} (C) {x : x ∈ N and 2x – 1 = 0} (D) {x : x ∈ N and x is a prime no.}

Answer»

Answer is 

(D) {x : x ∈ N and x is a prime no.}.



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