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Jacobstoltzfus
20.11.2019 •
Mathematics
Plz hurry it's !
you randomly draw marbles from a bag containing 4 blue and 2 green marbles, without replacing the marbles between draws. what is the probability of drawing a green marble on both your first and second draws?
a. 1/2⋅1/4
b. 2/6⋅1/5
c. 2/6⋅1/6
d. 2/6⋅2/6
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Ответ:
B)![\frac{2}{6}\times \frac{1}{5}](/tpl/images/0383/2438/40b89.png)
Step-by-step explanation:
Number of blue marbles =![N(blue)=4](/tpl/images/0383/2438/b619f.png)
Number of green marbles=![N(green)=2](/tpl/images/0383/2438/d49fa.png)
Total number of balls=![N=N(blue)+N(green)=4+2=6](/tpl/images/0383/2438/662d9.png)
Probability of drawing a green marble on first draw=![P(green_1)=\frac{N(green)}{N}=\frac{2}{6}](/tpl/images/0383/2438/aece0.png)
After drawing a green marble a 2nd draw is made without replacement.
So, now
and ![N=6-1=5](/tpl/images/0383/2438/0867d.png)
Probability of drawing a green marble on 2nd draw=![\frac{N(green)}{N}=P(green_2)=\frac{1}{5}](/tpl/images/0383/2438/944db.png)
∴ Probability of drawing a green marble on both your first and second draws=![P(green_1)\times P(green_2)=\frac{2}{6}\times \frac{1}{5}](/tpl/images/0383/2438/c5666.png)
Ответ:
6 in sq
Step-by-step explanation: