X=sum(n=0)^oo a^n ,Y=sum(n=0)^oo b^n and...

`X=sum_(n=0)^oo a^n ,Y=sum_(n=0)^oo b^n and Z=sum_(n=0)^oo c^n` where `a,b,c in (0,1) and a,b,c` are in A.P then

A

`X,Y,Z` are in A.P

B

`X,Y,Z` are in G.P

C

`1/X,1/Y,1/Z` are in A.P

D

`1/X,1/Y,1/Z` are in H.P

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