1.

If P = {3x|x ∈N,x ≤ 50}, Q = {5x|x ∈N, x ≤ 30}, then n(P ∩ Q) =…………….. A) 5 B) 8 C) 2D) 15

Answer»

Correct option is (C) 2

\(P=\{3x|x\in N,x\leq50\}\)

\(\Rightarrow P=\{3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48\}\)

And \(Q=\{5x|x\in N,x\leq30\}\)

\(\Rightarrow Q=\{5,10,15,20,25,30\}\)

\(\therefore\) \(P\cap Q=\{15,30\}\)

\(\therefore\) \(n(P\cap Q)=2\)

Correct option is C) 2



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