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Lv 6
? asked in Science & MathematicsMathematics · 8 years ago

Can someone solve this problem?

can someone solve this problem in my profile picture? click on it to get a better view if you can't see it that well.

1 Answer

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  • ignoramus
    Lv 7
    8 years ago
    Favorite Answer

    120

    . . Σ (9 - ⅓ n)

    . .2

    9 - ⅓ n = (27 - n) / 3

    So the first few terms are

    25/3 + 24/3 + 23/3+ 23/3 + . . . . . etc.

    This is an arithmetic series with common difference -⅓

    so the sum = (25/3) - (n - 1)(-⅓)

    . . . . . . . . . . = (25 - n) / 3

    For 2 to 120 makes 118 terms in all, therefore

    sum = (25 - 117) / 3 = -92 / 3

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