Question 68

The square root of which of the following numbers is irrational?

Solution

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'2916' is the square of 54. It is a perfect square. 
'4489' is the square of 67. It is a perfect square.
'1024' is the square of 32. It is a perfect square.
'7840' is not a perfect square and the square root of 7840 is an irrational number. 
Hence, option D is the correct answer.

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