Answer:
216 outcomes.
Explanation:
When you roll one 6 sided die you have a 1/6 chance,
when you roll two 6 sided dies you have a 1/36 chance,
when you roll three 6 sided dies you have 1/216 chance,
6x6x6
1 1 1
_ _ _
6 36 216
There are 6 possible outcomes per roll and three 3 rolls = 6 x 6 x 6 = 216 possible outcomes, assume by outcome one counts each possible sequence separately. If you only count the sum of three rolls, then the possible outcomes are the integers from 3 to 18 inclusive, or 16 possible outcomes. Obviously you mean the former.
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