Counting and Probability
Finding the odds in favor and against
Linda is at the grand opening celebration of a supermarket. She spins a wheel with 10 equal-sized slices, as shown below. The wheel has 3 black slices, 3 grey
slices, and 4 white slices. When the wheel is spun, the arrow stops on a slice at random. If the arrow stops on the border of two slices, the wheel is spun again.
(a) If the arrow stops on a black slice, then Linda wins a gift card. Find the
odds against Linda winning a gift card.
(b) If the arrow stops on a black slice, then Linda wins a gift card. Find the
odds in favor of Linda winning a gift card.
Explanation
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