Three balls are to be randomly selected without replacement from an urn containing 20 balls numbered 1 through 20. If x represent the largest number to be drawn, then find e(x).
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Step-by-step explanation:
Three balls are to be randomly selected without replacement from an urn containing 20 balls numbered 1 through 20. If we bet that at least one of the balls that are drawn has a number as large as or larger than 17, what is the probability that we win the bet?
My solution:
(
4
1
)(
19
2
)
(
20
3
)
Reason: (
4
1
) is of choosing either 17, 18, 19, or 20. (
19
2
) once a urn is chosen which is either 17,18, 19 ,20. There are 19 balls left and the value does not matter.
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