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CBSE Class 11-science Answered

IOF A,B,C ARE IN A.P. AND 1/B,1/C,1/D ARE IN A.P PROVE THAT AD=BC
Asked by | 13 Mar, 2012, 10:20: PM
answered-by-expert Expert Answer
Here ,  B-A = C-B , 1/C - 1/B = 1/D - 1/C
So in the second equation we get
(B-C)/BC = (C-D)/CD
(A-B)/BC = (C-D)CD
A/B  - 1 = C/D  - 1
A/B  =  C/D
AD = BC
Answered by | 14 Mar, 2012, 09:31: AM
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