Find the number of natural numbers between 72 and 92.
A
29
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B
30
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C
31
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D
32
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Solution
The correct option is C 31 Number of natural numbers between n2 and (n+1)2 is 2n. So, number of natural numbers between 72 and 82 is 14. So, number of natural numbers between 82 and 92 is 16. 82 is also in between them. So, total = 14 + 1 + 16 = 31