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Date: 2007-07-23 06:25 pm (UTC)(i) n > 1*(n-1), so 1s are always useless
(ii) pulling out a 2 is at least as good if and only if 2(n-2) >= n, which is true iff n >= 4, therefore no point in using 4 or more
(iii) 2+2+2 = 3+3 but 2*2*2 < 3*3 (which is something I love writing down in a degree-level supervision!), so at most two 2s.