Clases GMATHome > GMAT Focus Edition Data Insight QUESTION > Data Sufficiency > Probability > A box contains only red chips, white chips, and blue chips. If a chip is (...)
A box contains only red chips, white chips, and blue chips. If a chip is randomly selected from the box, what is the probability that the chip will be either white or blue?
Difficulty: 600-700 Level, Data Sufficiency (DS)
Monday 25 July 2022, by
A box contains only red chips, white chips, and blue chips. If a chip is randomly selected from the box, what is the probability that the chip will be either white or blue?
(1) The probability that the chip will be blue is 1/5.
(2) The probability that the chip will be red is 1/3.
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EXPLANATION:
The probability that the chip will be either white or blue, equals to the probability that the chip will NOT be red, thus P(white or blue)=1-P(red).
(1) The probability that the chip will be blue is 1/5. Not sufficient.
(2) The probability that the chip will be red is 1/3. P(white or blue)=1-P(red)=1-1/3=2/3. Sufficient.
Answer: B.