How many natural numbers lie between (5) ^ 2 and (6) ^ 2?

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A 9
B 10
C 11
D 13

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Answer: B. 10

5^2 = 25 and 6^2 = 36. The natural numbers between them are 26 to 35, which is 10 numbers. In general, there are 2n numbers between n^2 and (n + 1)^2; here 2 x 5 = 10.

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How many natural numbers lie between (5) ^ 2 and (6) ^ 2?

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