OpenStax, Algebra and Trigonometry 2e §13.5 Counting Principles · Exercise 43 · Combinatorics · Permutations & combinations
Counting Principles · Exercise 43
The number of 5-element subsets from a set containing elements is equal to the number of 6-element subsets from the same set. What is the value of (Hint: the order in which the elements for the subsets are chosen is not important.)
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OpenStax, Algebra and Trigonometry 2e · §13.5 Counting Principles · Exercise 43
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