To roll a seven you could have
(1,6) (6,1) (2,5) (5,2) (3,4) (4,3)
6 different ways so 6/36 reduces to 1/6 way of
getting a 7
For getting an even number as
sum, we can have (1,1) or (1.3) or (1,5) or (2,2) or (2,4) or (2,6) or (3,1) or
(3,3) or (3,5) or (4,2) or (4,4) or (4,6) or (5,1) or (5,3) or (5,5) or (6,2)
or (6,4) or (6,6) 18 ways, probability is 18/36 reduces to ½
So for either one you now have
1/6 + 1/2 = 6+2/12 = 8/12 reduced to 2/3
