SOLUTION: What is the probability of getting a sum of 20 when rolling three fair six-sided dice? (Express your answer in decimal form if your answer is not whole number.)

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Question 1192888: What is the probability of getting a sum of 20 when rolling three fair six-sided dice? (Express your answer in decimal form if your answer is not whole number.)
Found 2 solutions by ikleyn, math_tutor2020:
Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
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I just answered this question under the link

https://www.algebra.com/algebra/homework/testmodule/testmodule.faq.question.1192883.html


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Answer by math_tutor2020(3817) About Me  (Show Source):
You can put this solution on YOUR website!

Answer: 0

Reason:
The highest number you can get on a standard six sided die is "6".
Having three such copies added together will get us 6+6+6 = 18 which is two units short of the goal of 20.
Therefore, it is impossible to get a sum of 20 with three standard six sided dice.
The probability 0 indicates events that are impossible to occur.

You could reach 20 if you used non-standard dice, but I'll assume that your teacher is referring to standard dice.