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math problem please help

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find sum of the first 10terms of geometric series with a2=1/2 and r=2

  • math problem please help - ,

    If a(2) = 1/2 , with r = 1/2
    then a(1/2)r = 1/2
    and a = 1
    now just use the formula
    sum(10) = 1( 1 - (1/2)^10)/(1-1/2)
    = (1 - 1/1024)/(1/2)
    = 2(1023/1024)
    = 1023/512

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