Prove inequality 1 + 1 / √ 2 + 1 / √ 3 +. + 1 / √ n

When n = 1, left = 1 and right = 2 hold
Suppose n = K
That is 1 + 1 / √ 2 + 1 / √ 3 +. + 1 / √ K

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