Which one among the following is the smallest?
If the difference between all the pairs is same, then the pair whose first number is the greatest will be the smallest pair, and vice-versa the pair with smallest number will be largest.
Here, difference in each pair is 2, thus $$\sqrt{401}-\sqrt{399}$$ is smallest, and $$\sqrt{101}-\sqrt{99}$$ is largest.
=> Ans - (A)
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