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Question

Write the following set in roster form.
A = {x:x=n2n+1,where n ϵ N and n<4}

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Solution

Given n ϵ N and n<4

So, n = 1, 2, 3.

Also, x=n2n+1

Substituting n = 1, 2, 3 we get,

x=12(1)+1=13

x=22(2)+1=25

x=32(3)+1=37

The required set is A = {13,25,37}


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