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  1. (c) Methods of buying 2 books using ≦ $50 are: {16+16,16+20,16+28,16+34, 20+20... buying 1 book using ≦ $50 are: {16, 20, 28, 34} ∴ no. of ways buying 1 book using ≦ $5 = 6*8*4*6 = 1,152‬ Method of buying 3...

    分類:科學及數學 > 數學 2020年04月10日

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