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Question

The roster form of the set {x:x=n2n+1,where n ϵ N and n<4} is ________.


A

{12,23,35}

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B

{13,25,37}

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C

{13,15,17}

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D

{23,25,27}

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Solution

The correct option is B

{13,25,37}


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 {13,25,37}


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