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Question

The rth, sth and tth terms of a certain G.P. are R, S and T respectively, then the value of RstStrTrs is-
  1. 0
  2. 1
  3. -1
  4. 2

A
0
B
1
C
2
D
-1
Solution
Verified by Toppr

Let the common ratio be taken as k and a be the first term.
R=akr1
Rst=astk(r1)(st) similarly
Str=atrk(s1)(tr)
Trs=arsk(t1)(rs)
Multiplying the above three and knowing that
RstStrTrs=a0.k0=1

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