Correct option is: D) sure event
When a dice is rolled the possible outcomes are {1, 2, 3, 4, 5, 6}
Total No of outcomes is n (S) = 6
Total No of numbers less than or equal to 6 = n(E) = 6
\(\therefore\) Probability of getting a number less than or equal to 6 is
P = \(\frac {n(E)}{n(S)} = \frac 66 = 1\) which is probability of sure event.
\(\therefore\) The event of getting a number less than or equal to 6 in a dice rolling is a sure event.