McGraw-Hill Education SAT Subject Test Math Level 2 by John J. Diehl

Author:John J. Diehl
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2019-12-21T16:00:00+00:00

EXAMPLE: The are 12 pieces of colored chalk in a package—3 white, 3 yellow, 3 orange, and 3 green. If two pieces are selected at random, find the probability that both will be yellow.

The probability of choosing the first yellow piece of chalk is:

Once one piece is chosen, there are only 11 pieces left in the package. The probability of choosing the second piece of yellow chalk is:

The answer is therefore:

Notice that in the previous problem the first piece of chalk is not replaced before the second is drawn. This decreases the total number of outcomes to 11 when the second piece of chalk is selected.

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