Sum of fall dices
What is the probability that the sum of 9 will fall on a roll of two dice?
Hint: write down all the pairs that can occur as follows:
11 12 13 14 15. .
21 22 23 24. ...
31 32. ..
. .
. . . .. . 66, count them; it's the variable n
Variable m: 36, 63,... write it down and, count it, and substitute it into the formula.
Hint: write down all the pairs that can occur as follows:
11 12 13 14 15. .
21 22 23 24. ...
31 32. ..
. .
. . . .. . 66, count them; it's the variable n
Variable m: 36, 63,... write it down and, count it, and substitute it into the formula.
Correct answer:
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