Solution: The probability that a black marble will drawn

A box contains 3 red marbles and 5 black marbles. A red marble is drawn and was not replaced back to the box. What is the probability that a black marble will drawn?

The probability that a black marble will drawn

Problem Statement:

A box contains 3 red marbles and 5 black marbles. A red marble is drawn and was not replaced back to the box. What is the probability that a black marble will drawn?

Problem Answer:

The probability that a black marble will drawn is P = 5/7.

Solution:

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