One event (A) is less likely to occur than another event (B) when the theoretical probability of the event (A) is less then that of the other event (B).

If the probability of event A is less than the probability of event B, then event A is less likely to occur then event B.

Each numeral on a die is equally likely to occur when a die is tossed.

From this we can make conclusions such as the following:

• Getting a one on the toss of a die is less likely than getting a four, five or six, since the probability of getting a one is less than the probability of getting a four, five or six.