Probability

- If
*E*and*F*are two events associated with the sample space of a random experiment, then the conditional probability of event*E*, given that*F*has already occurred, is denoted by P(*E*/*F*) and is given by the formula:

P (*E*/*F*) =, where P (*F*) ≠ 0

**Example:**

A die is rolled twice and the sum of the numbers appearing is observed to be 7. What is the conditional probability that the number 3 has appeared at-least once?

**Solution:**

Let *E*: Event of getting the sum as 7 anâ€¦

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