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Question

Write the set builder form A = {−1, 1}

A
A = {x:x is a real number}
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B
A = {x:x is an integer}
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C
A = {x:x is a root of the equation x2 = 1}
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D
A = {x:x is a root of the equation x2+1 = 0}
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Solution

The correct option is C A = {x:x is a root of the equation x2 = 1}
Clearly there are two element in the set A which is obtained just by solving the equation x2 = 1
A can be rewritten as in the set builder form = {x:x is a root of the equation x2 = 1}

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