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C(2000, 2) + C(2000, 5) + C(2000, 8 ) +...+ C(2000, 2000) = (2^2000 - 1) / 3
C(2000, 2) + C(2000, 5) + C(2000, 8 ) +...+ C(2000, 2000) = (2^2000 - 1) / 3
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