emberjohnson26
10.12.2020 •
Mathematics
A jar contains 12 marbles. Four are red, 3 are white, and 5 are blue. A marble is randomly selected, its color recorded, and then the marble is NOT returned to the jar. A second marble is selected. What is the probability that a red and blue marble are selected?
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Ответ:
1/11
Step-by-step explanation:
Step one:
given
sample size
12 marbles.
sample space
4 red,
3 are white, and
5 are blue.
Step two:
when a marble is selected without replacement the sample size reduces.
the first selection is 4/12
The second selection is 3/11
The probability of the two events is
4/12*3/11
= 12/132
=1/11
Ответ:
72
Step-by-step explanation:
-3×6= -18
-18×4=72
so I got 72 and an answer