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Question

The rationalising factor for rationalization of the denominator of 2157 is

A
5
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B
7
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C
35
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D
21
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Solution

The correct option is B 7
Case 1:
2157×77=213549=21357

denominator of the fraction i.e. 7 is a rational number.

Hence, the rationalising factor for rationalizing the denominator is 7

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