SAT Math Practice Question #31016 - SATify | SATify

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SAT Math Practice Question #31016 - SATify | SATify

#31016

counting

probability

medium

45 sec

A bag contains only red, blue, and green marbles. A marble is selected at random from the bag. Let $P_{R}$ be the probability of selecting a red marble, $P_{B}$ be the probability of selecting a blue marble, and $P_{G}$ be the probability of selecting a green marble. Which of the following statements must be true?

A.

$P_{R} + P_{B} = 1$

B.

If the number of green marbles is greater than the number of red marbles, then $P_{G} ＞ P_{R}$ .

C.

$P_{R} + P_{B} + P_{G} < 1$

D.

If there are 10 red marbles and 20 blue marbles, then there must be 30 green marbles.