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cancerbaby209
05.02.2020 •
Mathematics
Ajar has five red marbles in at 10 blue ones if you randomly pick a marble without replacing it and then select another what is the fractional probability of getting two red?
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Ответ:
2/21
Step-by-step explanation:
We know that there is a jar which has 5 red marbles and 10 blue marbles in it.
We are to find the fractional probability of getting two red marbles if we randomly pick a marble and then without putting it back we pick another one.
P (getting red marble on first time) =![\frac{5}{15} =\frac{1}{3}](/tpl/images/0502/4198/90f9b.png)
P (getting red marble on second time) =![\frac{4}{14} =\frac{2}{7}](/tpl/images/0502/4198/91831.png)
P (getting two reds) =![\frac { 1 } { 3 } \times \frac { 2 } { 7 } = \frac { 2 } { 2 1 }](/tpl/images/0502/4198/8b7fc.png)
Ответ: