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Question

If x,y and z are in AP, then x, y−1 and z are in?

A
AP
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B
GP
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C
HP
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D
a or b
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E
none of these
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Solution

The correct option is C HP

Option (c)
Take y=2 and x+y1xy = 1 and (y+z)1yz= 3

When y=2. x=13 and z = 17,

2(13)(17)(17)(13)=12=y1... hence they are in HP


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