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19 March, 14:07

Use the formula to evaluate the series - 3+6-12+24

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  1. 19 March, 14:13
    0
    I believe the answer is 15
  2. 19 March, 16:33
    0
    -3+6-12+24

    = - 3 (1 - 2) - 12 (1-2)

    = (1 - 2) (-3 - 12)

    = (-1) (-15)

    = 15
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