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Question

Given the universal set {x : xϵN and x < 20}, then find : A = {x : x = 3p ; pϵN}.

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Solution

Universal set is {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 }
Of these, multiples of 3 are 3,6,9,12,15,18
So, A={3,6,9,12,15,18}.

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