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Dmitrij [34]
3 years ago
7

A bag contains 6 red marbles, 4 blue marbles, 7 green marbles, and 3 yellow marbles. A marble is drawn from the bag and is not r

eplaced. Then a second marble is drawn. What is the probability that both marbles drawn were green? . Option A: 49/380. Option B: 49/400. Option C: 21/190. Option D: 21/200.
Mathematics
2 answers:
Mademuasel [1]3 years ago
5 0
\frac{7}{6 + 4 +7 +3} x \frac{7 - 1 }{ 6 + 4 + 7 + 3 - 1}

= 21/190

So the answer is option C.

hope this helps
Alinara [238K]3 years ago
3 0
20 total marbles....7 are green

probability on first draw is 7/20...and since the marble was not replaced, the probability on the second draw is 6/19. And since they cant happen at the same time, we multiply

7/20 * 6/19 = 42/380 which reduces to 21/190

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