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Math Help - algebra

  1. #1
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    algebra

    write the series in summation notation.
    7+14+21+28+35+42= ????
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kalez21 View Post
    write the series in summation notation.
    7+14+21+28+35+42= ????
    Hint: the terms are all multiples of 7
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