Probability

[anteater85]

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If X is to be chosen at random from the set of all factors of 180, what is probability that x/3 is an integer?

answer is 66.6% or 2/3

 

[Streetwolf]

If X is to be chosen at random from the set of all factors of 180, what is probability that x/3 is an integer?

answer is 66.6% or 2/3

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180

Which are divisible by 3?

3, 6, 9, 12, 15, 18, 30, 36, 45, 60, 90, 180 = 12 of them
There are 18 total.

12/18 = 66.67%

 

[dentrilla]

You think they would have a question like this on the DAT? It's not difficult but man it could definitely take up a lot of time