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Properties of Square Numbers

How many non-...

Question

How many non-perfect square numbers are there between the squares of 20 and 21?

A

32

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B

36

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C

40

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D

42

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Solution

The correct option is C
40

We know that there are 2n non-perfect square numbers between the squares of the numbers n and (n+1).

Thus, there are 2 x 20 = 40 non-perfect square numbers between the squares of 20 and 21.

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