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Question

Which of the following is not a quadratic surd?

A
312
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B
23
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C
32
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D
2514
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Solution

The correct option is C 32
Quadratic surds are the surds whose order is '2'
312 and 23 has order '2'
32 has order 3
Fourth option 2514 can be written as
2514 = (52)14 = 512 which is again a quadratic surd
Hence only option third 32 is not a quadratic surd

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