Exercise 1 Page 780

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b Now, we are asked to find the probability of getting a red card or the number

5

if a card is chosen randomly. Since the number five is a yellow card, the events are mutually exclusive. Again, we first need to find

P (red)

and

P (5) .

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c Now, we are asked to find the probability of getting a red card or a yellow card if a card is chosen randomly. Since a card cannot be red and yellow at the same time, the events are mutually exclusive. Again, we first need to find

P (red)

and

P (yellow) .

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d Finally, we are asked to find the probability of getting a yellow card or a letter if a card is chosen randomly. Note that the card with the letter B is also yellow. Thereforewe have overlapping events. If

A

and

B

are overlapping events,

P (A or B)

is given as follows.

P (A or B) = + P (A) + P (B) - P (A and B)

Let's set

A = yellow

and

B = letter .

We can now rewrite the given formula as follows.

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Subchapter links

Lesson Check p.780

Practice and Problem-Solving Exercises p.780-782

Standardized Test Prep p.782

Mixed Review p.782

Exercise 1 Page 780

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