bcaughman6885
26.02.2021 •
Mathematics
A bag contains 8 red marbles, 4 blue marbles, and 5 white marbles. Tom picks two marbles at random, without replacement.
What is the probability that Tom picks two blue marbles?
What is the probability that Tom picks a red and a blue marble?
What is the probability that Tom picks two red marbles?
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Ответ:
P(B,B) = 3/68
P(R,B) = 2/17
P(R,R) = 7/17
Step-by-step explanation:
P(B,B) = 4/17 · 3/16 = 3/68
P(R,B) = 8/17 · 4/16 = 2/17
P(R,R) = 8/17 · 7/16 = 7/17
Ответ:
15 hours
Step-by-step explanation:
120 + 12x = 300
subtract 120 from each side
12x = 180
divide by 12
x = 15