#892 · Combinatorics · Counting
Selections of fruit
From 3 cocoa nuts, 4 apples and 2 oranges, how many selections of fruit can be made if at least one of each kind is taken?
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.b, No. 20
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