n arithmetic means are inserted between ...

n arithmetic means are inserted between x and 2y and then between 2x and y. If the rth means in each case be equal, then find the ratio x/y.

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The correct Answer is:

` :. " " (x(n-r+1)+2yr)/(n+1) = (2x (n-r+1)+yr)/(n+1) rArr x/y = r/(n-r+1)`

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