thoconnery

a bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a red marble, replacing it, and then picking a black marble?

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sauravshakya

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P(R and B) = P(R) * P(B)

sauravshakya

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Can u find P(R) ?

thoconnery

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uhh...i dont exactly know what P(R) is.

sauravshakya

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Probability of picking a red marble

thoconnery

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5/15 so 1/3

sauravshakya

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Yes.
Now find P(B)

thoconnery

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4/15

sauravshakya

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Great
Now, find P(R and B)

thoconnery

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9/15...3/5

sauravshakya

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P(R and B) =P(R) * P(B) = 1/3 *4/15 =?

thoconnery

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4/45 ?
i think

sauravshakya

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\[\checkmark\]

thoconnery

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thank you so much!!

sauravshakya

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welcome