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rev correction
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j4ck4l-24 committed Jun 19, 2024
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Expand Up @@ -91,6 +91,7 @@ $$
$$
sum(comb(\{a_1, a_2, a_3\})) = \frac{(a_1 + a_2 + a_3)^2 - (a_1 + a_2 + a_3)}{2}
$$

In general:
$$
sum(comb(\{a_1, a_2, a_3, ...a_n\})) = \frac{\sum{a_i}* (\sum{a_i}-1)}{2}
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