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Math Help - finite arithmetic series sum

  1. #1
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    finite arithmetic series sum

    Find sum of terms of this finite arthm. series

    3+4.5+6+7.5 + ... 99

    Is this correct?

    The initial term is 3 and each number increases by 1.5...so

    S(65) = 1.5(3 + 65)*65/2
    S(65) = 1.5(68)*65/2
    S(65) = 1.5*65*34
    3,315
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  2. #2
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    yeah correct .
    Why do you think there is a problem ?
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  3. #3
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    I didn't. I just wanted to make sure i had it down. I was just reading the chapters.
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