SAT Math Multiple Choice Practice Question 370: Answer and Explanation

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Question: 370

18.

If a is a number chosen randomly from set X and b is a number chosen randomly from set Y, what is the probability that ab is greater than 20 but less than 50?

A.
B.
C.
D.
E.

Correct Answer: C

Explanation:

C This table shows all of the possible values of ab:

Of those, only the seven shaded values are greater than 20 and less than 50, so the probability is 7/25.

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