If I have 5 crayons (red, orange, yellow, green, blue) and I randomly choose 4, what are the chances that I do NOT choose green?
We have five crayons, one of which is green. If I choose four crayons at random, what are the odds of not picking the green one?
First, let's find the number of ways I can choose four crayons from the five available. This is a combinations problem (the order we pick the crayons doesn't matter). The general formula for a combination is:
Of those 5, there's only 1 way to pick crayons that don't have green (red, orange, yellow, blue). So there's only a