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Q.

If A={2x : x∈N},   B={3x : x∈N} and C={5x : x∈N) then A∩(B∩C) is equal to

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a

{15,30,45,…}

b

{10,20,30…}

c

30,60,90,…

d

{7,14,21…}

answer is C.

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Detailed Solution

(A∩B)∩C={2×3×5 x : x∈N}={30x : x∈N}
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