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4-18.

Troy has a number cube with the numbers

Remember that the probability of any event is:

P(rolls a

) There is only one way to roll a

and there are six possible outcomes on any given roll.

Knowing this, can you write the probability of rolling a? P(rolls an odd number)

How many odd numbers are there from

to ? P(rolls a factor of

) There are four factors of

: , , , and .

That means there are four possible successes.

Thus, the probability of rolling a factor ofis or .