Text: What is the probability of finding that the sum of upward points is greater than or equal to 7 when two dice are thrown at the same time?

Each sieve has six kinds of results, so there are 6×6=36 kinds of all results.

The basic events that the sum of upward points is greater than or equal to 7 are (2,6), (3,5), (3,6), (x, x), (x, 5), (x, 6),

(5, 3), (5, x), (5, 5), (5, 6), (6, 2)(6, 3), (6, x), (6, 5), (6, 6), * * 55 species,

It is concluded that the probability that the sum of upward points is greater than or equal to 7 is 55 36 = 5 52.