Question

A dice is thrown twice find the probability that 5 will come up at least once

Answer 1

For two throws of a dice n(S) = 36

Let us consider an event A of getting number 5 on at least one dice

A = { (1,5),(2,5),(3,5),(4,5),(5,1),(5,2),(5,3),(5,4),(5,5),(5,6),(6,5) }

P(A) = n(A)/n(S)

= 11/36