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If p^(th), q^(th), r^(th) terms of a H.P...

If `p^(th), q^(th), r^(th)` terms of a H.P be respectively a, b and c then `(q-r) bc + (r-p) ca + (p-q)ab`=

A

0

B

2abc

C

qpr

D

abc pqr

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A
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AAKASH SERIES-SEQUENCE AND SERIES-Practice Exercise
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  7. If a, b, c, d are in H.P then ab + bc + cd=

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  13. If the sum of the series 1+ (3)/(x) + (9)/(x^(2))+ (27)/(x^(3)) + …oo ...

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  14. If 3 + (3 + d) (1)/(4) + (3+ 2d) (1)/(4^(2)) + …oo= 8 then d=

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