a) \(\frac{C^{3}_{8}}{C^{3}_{40}}\approx 0,006\).
b) \(1-\frac{ C^{3}_{32}}{C^{3}_{40}}\approx 0,498\).
c) \(\frac{ C^{3}_{22}}{C^{3}_{40}}\approx 0,156\).
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