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Question

If x, y and z are the arithmetic, geometric and harmonic means of two positive numbers respectively .Then the relation between x, y and z is


A

xz=y2

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B

xy=z2

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C

xy=z

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D

xz=y4

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Solution

The correct option is A

xz=y2


Let the two positive numbers be a and b.
A.M. of the two numbers is (a+b)2
H.M. of the two numbers is 2aba+b
G.M. of the two numbers is (ab) (12)
The relation is (A.M.)×(×(H.M.)=(G.M.)2
xz = y2

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