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16 December, 18:14

Find the sum.

5 + 6 + 7 + ... + 11

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  1. 16 December, 18:41
    0
    5+6+7+8+9+10+11=56

    and that's the answer

    There's also a formula (5+11) / 2*7=56 (you take the average of the first and last terms and multiply that by the number of terms)
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