given right triangle ABC with altitude BD drawn to hypotenuse AC. If BD = 24 nd DC = 12, what is the length of AD?
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The two colors can be chosen in 3 different ways.
<h3>In how many ways can we choose two colors?</h3>
If we have a set of N elements, the number of different sets of K elements (such that the order of the K elements does not matter) is:
In this case, we have 3 colors, so N=3, and we want to choose 2, then K=2.
Replacing that we get:
The two colors can be chosen in 3 different ways.
If you want to learn more about combinations:
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