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Math Help - sequence & series

  1. #1
    Member maybeline9216's Avatar
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    sequence & series

    pls teach me qn 15(ii).thks!
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  2. #2
    Super Member flyingsquirrel's Avatar
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    Here are few extra steps that should lead you to the answer:
    1. Find a real number a such that the sequence (v_n)_{n\geqslant1} defined by v_n=u_n-a is geometric with common ratio k.
    2. Express v_n in terms of n and k.
    3. Express u_n in terms of n and k.
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