Respuesta :

Total  elements in sample space = 36.

There are 6  possible for  sum of 7  so P(sum 7) = 6/36 = 1/6

P(sum 11) = 2/36 = 1/18 

P(sum = 7 or 11) = 1/6 + 1/18 = 3/18 + 1/18 = 2/9 (answer)