# What is

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

Correct result:

p =  0.111

#### Solution:

$n=6 \cdot \ 6=36 \ \\ 3+6; 4+5; 5+4; 6+3 \ \\ m=4 \ \\ \ \\ p=\dfrac{ m }{ n }=\dfrac{ 4 }{ 36 }=\dfrac{ 1 }{ 9 }=0.111$

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