Question

A five-sided solid has the numbers 1, 2, 3, 4, and 5. What is the probability of rolling two five-sided number solids and getting a sum of either a 3 or an 8?

A. 6/625
B. 9/625
C. 6/25
D. 1/5

Answer 1

The answer is D. 1/5 hopefully this helps!

Answer 2

probability = # of positive events / # of total events.

# of total events = 5x5 = 25

positive events = sum either 3 or 8:

1) 1 + 2 = 3
2) 2 + 1 = 3
3) 3 + 5 = 8
4) 4 + 4 = 8
5) 5 + 3 = 8

# of positive events = 5

probability = 5 /25 = 1/5

Answer: option D. 1/5