SOLUTION: What is the probability that the ones digit is 9 in the sum of two two-digit prime numbers? a) 4/10 b) 3/10 c) 0 d) 4/9 e) 1/3

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Question 283076: What is the probability that the ones digit is 9 in the sum of two two-digit prime numbers?
a) 4/10 b) 3/10 c) 0 d) 4/9 e) 1/3


Answer by nabla(475) About Me  (Show Source):
You can put this solution on YOUR website!
There are 21 two digit prime numbers:
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97
Can you make a 9 by adding any two of 1,3,7,9? Hence, one should choose c as the answer.