A fair dice is rolled, the sample space is 1 2 3 4 5 6 find P(2), P(Even numbers), P(less than 3), P(greater than 2), P(7) and P(less than 10)

A dice is rolled, event A `is that the dice comes up with 3 and event B is that the dice comes up with an even number. Are the events Mutually exclusive?

Addition of Rule of Probabilities P(A Or B) = P(A) +P(B) - P(A and B) for mutually exclusive events the last part P(A and B) is zero, why?