Hi

Two dice are rolled:

P(getting 5 on either)= P(one being a 5 'and' one not being a 5)= 1/6*5/6

P(getting 5 on either 'or' sum of 5) = 1/6*5/6 + 4/36 = 9/36 = 1/4

___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

 

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