The rth, sth and tth terms of a certain G.P. are R, S and T respectively, then the value of Rs−tSt−rTr−s is-
0
1
-1
2
A
0
B
1
C
2
D
-1
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Solution
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Let the common ratio be taken as k and a be the first term. R=akr−1 ∴Rs−t=as−tk(r−1)(s−t) similarly St−r=at−rk(s−1)(t−r) Tr−s=ar−sk(t−1)(r−s) Multiplying the above three and knowing that ∴Rs−tSt−rTr−s=a0.k0=1
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