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Question

Simplify 127 by rationalising the denominator.


A

2+73

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B

233

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C

233

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D

2+73

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Solution

The correct option is A

2+73


The least rationalising factor of 127 is 2+7

So, multiplying and dividing by 2+7, we get,

127×2+72+7

=2+72272

=2+73


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