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The least positive integer n for which √n+1 - √n-1 < 0.2 is (a) 24 (b) 25 (c) 26 (d) 27

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The least positive integer n for which √n+1 - √n-1 < 0.2 is

(a) 24

(b) 25

(c) 26

(d) 27

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1 Answer

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Answer is : (c) 26

We have,

On squaring both side, we get

∴ Minimum value of n = 26

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