Given the set u = {1, 2, 3, 4, 5, 6}, for the set a ⊆ u, define s (a) as the sum of all elements in a, then the sum s of all s (a)=______ ．

⊆ u = {1, 2, 3, 4, 5, 6}, a ⊆ u, then there are a total of C05 + C15 + C25 + C35 + C45 + C55 = 25 = 32 A with 1, and there are 32 A with 2, 3, 4, 5, 6, so s (a) = 32 × (1 + 2 + 3 + 4 + 5 + 6) = 32 × 21 = 672

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