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Question

Given the universal set {x:x\epsilonN,10<x<15} .List the elements for A={x:x<10}

A
{14,15,16,18,19,20}
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B
{14,15,16,18,19}
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C
{12,13}
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D
Null set
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Solution

The correct option is D Null set
Since the universal set contains the elements 11,12,13,14 only
But the set A has the elements which are less than 10
which clearly does not belong to the universal set
Hence the set A is a null set (It has no elements)

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