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Nataly [62]
2 years ago
7

There are 3 black marbles and 4 red marbles in a bag.

Mathematics
1 answer:
devlian [24]2 years ago
8 0
3 + 4 = 7 all marables in bag
The probability that the first marable is black
P(A_1)=\dfrac{3}{7}
The probability that the second marable is black too
P(A_2)=\dfrac{2}{6}=\dfrac{1}{3}
Together:
P(A)=P(A_1)\cdot P(A_2)=\dfrac{3}{7}\cdot\dfrac{1}{3}=\dfrac{1}{7}\to D



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