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How do I use the sigma notation to express the series : 1+5+25+125+625+3125?

  • Math -

    First try to make a relation/rule between the different terms:
    1=50
    5=51
    25=52
    125=53
    625=54
    3125=55

    So you are really summing
    50+51+52+53+54+55

    So you would end up with:

    i=5
    Σ 5i
    i=0

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