If you throw a die for two times what is the probability tha

If you throw a die for two times, what is the probability that you will get a one on the first throw or a one on the second throw (or both)?

Solution

The exhaustive events of a die for two times is 6*6 = 36

Let A denote one on first throw

      B denote one on sencomd throw

P(A or B) = P(A) + P(B) - P(A and B)

               = 6/36     +      6/36     -      1/36  

               = 11/36