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Question

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

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