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Question

Write the following set in roster form.
A = {x:x=2r+3, where r ϵ I and 2<r3}

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Solution

Given 2<r3 and rϵI

So, r = -1, 0, 1, 2, 3. Also x=2r+3

Substituting r = -1, 0, 1, 2, 3, we get:

x=2(1)+3=1

x=2(0)+3=3

x=2(1)+3=5

x=2(2)+3=7

x=2(3)+3=9

Set A = {1, 3, 5, 7, 9}


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