A bag contains 4 red marbles and 5 blue marbles. If two marbles are chosen at random, one at a time and without replacement, wha
t is the probability of getting two red marbles?
A. 5/18
B. 40/81
C. 16/81
D. 1/6
2 answers:
P(red) 4/9 on the first pull, P(red) 3/8 on the second pull
(4/9)(3/8) = 12/72 = 1/6 Letter D
Answer:
1/6
Step-by-step explanation:
for the first marble
it might be red or blue
so P (the first red)=4/9
then if the first one is red ,
now we have 3 red and 5 blue ,
the second one might be red again or blue
so P(the second red)= 3/8,
ok
now
P(get two red)=P(the first red) X P(the second red)=4/9x3/8=1/6
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