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Math Help - Sequences

  1. #1
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    Sequences

    a normal geometric sequence is:
    un=u1*(r^n-1)

    but a compound interest geometric sequence is:
    u(n+1)=u1*(r^n)

    how do i know when to use which?
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  2. #2
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    Hello juliak
    Quote Originally Posted by juliak View Post
    a normal geometric sequence is:
    un=u1*(r^n-1)

    but a compound interest geometric sequence is:
    u(n+1)=u1*(r^n)

    how do i know when to use which?
    These define the same sequence. The second is simply the first with n replaced by (n+1).

    Grandad
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