Multi-Event Probability
ISEE Upper Level · Flashcards · Application
ISEE UPPER LEVEL · FLASHCARDS
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QUESTION
A card is drawn from a
52
52
52
-card deck. What is
P
(
heart or king
)
P(\text{heart or king})
P
(
heart or king
)
?
QUESTION
A fair die is rolled twice. What is the probability of at least one
6
6
6
?
QUESTION
A fair die is rolled twice. What is the probability both rolls are even?
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ANSWER
1
4
\frac{1}{4}
4
1
. Each roll has
P
(
even
)
=
3
6
=
1
2
P(\text{even})=\frac{3}{6}=\frac{1}{2}
P
(
even
)
=
6
3
=
2
1
, and independent, so
(
1
2
)
2
\left(\frac{1}{2}\right)^2
(
2
1
)
2
.
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