Hello, Zhankfor!

For each roll, there are outcomes.What is the probabiity of rolling a "7" at least once in three rolls of two dice?

Six of them result in a "7": .

Hence, the probability ofgetting a 7 is: .not

The opposite of "at least one 7" is "7's" ... that is, "3 Others"no

. .

Therefore: .