Question

If a1,a2,.....,an are in H.P then a1a2+a2a3+..+a n-1 a n =?

Answer 1

@ParthKohli

Answer 2

well, remember telescopic sums?

Answer 3

(a1-an )/d then ?

Answer 4

\[a_n = a_1 + (n-1)d\]Just solve for \(d\) in the above.

Answer 5

so it is 1-n ?

Answer 6

no... its not that d ...

Answer 7

hey this is in H.P!

Answer 8

anyway i got the idea.....

Answer 9

yeah, true.

Answer 10

Thanks

Answer 11

no problem :)