If a,b,c are in H.P and ab+bc+ca=15 then...

If `a,b,c` are in H.P and `ab+bc+ca=15` then `ca=`

A

bbaa

B

bbab

C

aabb

D

baba

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The correct Answer is:

A

The series is a b c a b / b c a b c / c a b c a

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