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If 1/5 : 1/N = 1/N : 1/1.25, then the value of N is?

Correct Answer: 2.5

Explanation:

Given 1/5 : 1/N = 1/N : 1/1.25
⇒ 1/5 x 1/1.25 = 1/N x 1/N
⇒ N2 = 5 x 1.25 = 6.25
∴ N = 2.5


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