# Two balls are drawn from a bag containing 5 white and 7 black balls at random. What is the probability that they would be of different colours?

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If the first ball is replaced:

If the first ball is not replaced:

If the first ball is replaced:

However, if the first ball is NOT replaced, the probability changes for the second ball. There are fewer of one color and one ball less.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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