Hi

___1_2_3__4__5__6

1|_2_3_4__5__6__7

2|_3_4_5__6__7__8

3|_4_5_6__7__8__9

4|_5_6_7__8__9_10

5|_6_7_8__9_10_11

6|_7_8_9_10_11_12

Just count them...(36 ways of rolling the two dice)

a. P(sum = 3) = 2/36 = 1/18

 b.  P(sum = 4) = 3/36 = 1/12

 c. 7

 d. 11 

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