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maths

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Given the G.P 05,0.005,0.0005.find the 7th term,
find the sum of the 1st 7th term

  • maths - ,

    I will assume to meant that first term to be .05
    a=.05
    r = .1

    term(7) = ar^6 = (.05) (.1)^6 = .00000005

    (notice term2 had 2 zeros before the 5
    term3 had 3 zeros before the 5
    ..
    term7 has 7 zeros before the 5 )

    sum(7) = (.05)(1 - .1^7)/(1 - .1)
    = .05555...

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