If x is the A.M. between a and b, y is t...

If x is the A.M. between a and b, y is the A.M. between b and c, while a, b, c are in G.P., then 1/x + 1/y =

A

a) 3/b

B

b) 1/b

C

c) 4/b

D

d) 2/b

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