if you roll a pair of dice, what is the probability that (at least) one of the dice is a 4 or the sum of the dice is 7 ?
Correct answer: D. 15/36
- A. 4/36
- B. 13/36
- C. 21/36
- D. 15/36
Explanation
There are 11 outcomes with at least one 4 and 6 outcomes whose sum is 7; 2 outcomes belong to both groups. Thus the union has 11 + 6 − 2 = 15 outcomes out of 36, giving 15/36.
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