Math

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Given a geometric progression:
0.05, 0.2, 0.8, ... Find the sum from the 5th term to the 8th term?

  • Math -

    That would be S8 - S4
    Since r = 4

    .05(4^8-1) - .05(4^4-1) = 3264

  • Math -

    a=0.05
    r=4
    S8=0.05(4^8-1)/3=1092.25
    S4=0.05(4^4-1)/3=4.25

    Sum from 5th term to 8th term is
    S8-S4=1088

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