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Question

What is the least rationalising factor of 72?



A

2

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B

7

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C

3

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D

5

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Solution

The correct option is D

2


We can write 72 as 2×2×2×3×3

72=2×2×2×3×3

=2×32=62

The rationalizing factor should be such that if we multiply it with 62, we get a rational number.

Hence, the least rationalising factor is 2 as 62×2=12 which is a rational number.


Mathematics

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