In the figure given above /ABD = /PQD = ...

In the figure given above `/_ABD = /_PQD = /_CDQ = pi/2`. If `AB = x, PQ = z and CD = y`, then which one of the following is correct ?

A

`1/x + 1/y = 1/z`

B

`1/x + 1/z = 1/y`

C

`1/z + 1/y = 1/x`

D

`1/x + 1/y = 2/z`

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