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Posted on May 09, 2018 7:34 AM

If set A = {–3, 2, 3, 7} and we denote each element of set A as 'n', then which of the following sets represents the elements of the type 'n2'?

{–9, 4, 49, 9}
{4, 9, 49}
(4, -9, 49)
{9, 4, 9, 49}


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What is the answer of this question it says wrong when i check the fourth no.