When do you add probabilities?

Answer 1

When they pertain to mutually exclusive possible outcomes.

For example, the probability of rolling a "2" on a six-sided die is #1/6#, the probability of rolling a "3" is #1/6# and the probability of rolling a "2" or "3" is #1/6+1/6 = 1/3#.
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Answer 2

You add probabilities when you want to find the probability of two or more events both occurring. This is done by adding the individual probabilities of each event if the events are mutually exclusive, or by using the addition rule of probability if the events are not mutually exclusive.

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Answer from HIX Tutor

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.

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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