SOLUTION: A bag contains 45 marbles, numbered 1 to 45, what is the probability of randomly selecting a marble that is a factor of 30 ?

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Question 1087888: A bag contains 45 marbles, numbered 1 to 45, what is the probability of randomly selecting a marble that is a factor of 30 ?
Answer by ikleyn(52781) About Me  (Show Source):
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If you do include 1 and 30 into the list of factors to the number 30, then the list of factors is

{1, 2, 3, 5, 6, 10, 15, 30}, 8 numbers in all.

Then your probability is 8%2F45.



If you do not include  1 and 30 into the list of factors to the number 30, then the list of factors is

{2, 3, 5, 6, 10, 15}, 6 numbers in all.

And then your probability is 6%2F45 = 2%2F15.



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