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Question

If x, y and z are in continued proportion then z:x::z2:y2.

A
True
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B
False
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Solution

The correct option is A True
If x,y and z are in continued proportion then y2=xz
Multiply both sides of the equation by z
equation becomes, zy2=xz2
(z/x)=(z2/y2)
z:x::z2:y2

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