One event (A) is more likely to occur than another event (B) when the theoretical probability of the event (A) is greater then that of the other event (B).
If the probability of event A is greater than the probability of event B, then event A is more likely to occur then event B.
Each numeral on a die is equally likely to occur when a die is tossed.
Sample space of throwing a die: { 1, 2, 3, 4, 5, 6 }
From this we can make conclusions such as the following: