Probability calculates the likelihood of an event occurring. The likelihood of the event occurring lies between 0 and 1. It is zero if the event does not occur and 1 if the event occurs.
For example, the probability that it would rain on Friday is between o and 1. If it rains, a value of one is attached to the event. If it doesn't a value of zero is attached to the event.
probability of not picking orange = total marbles that are not orange / total number of marbles
total marbles that are not orange = 7 +3 = 10
10 / 18
To transform to the simplest form. divide both the numerator and the denominator by 2
