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geometric

  1. N

    Difficult question which involves a geometric series

    I'm finishing off holiday work assigned to me before school starts back and I find myself stuck on this question all the time: "In any GP, let Rn = T(n + 1) + T(n + 2) + ... + T(2n). Show that Rn:Sn = r^n:1, and hence find r if R8:S8 = 1:81" This is how the question is printed in my textbook...
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