Given 3 dices are rolled, what is the probability of the sum of the faces is 6?

If n(A) is the number of elementary events in A

How do you get that?

P.S. How do I properly type permutations in latex? The first number is a bit far to the letter.

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- September 10th 2009, 06:45 PMchengbinDice probability
Given 3 dices are rolled, what is the probability of the sum of the faces is 6?

If n(A) is the number of elementary events in A

How do you get that?

P.S. How do I properly type permutations in latex? The first number is a bit far to the letter. - September 11th 2009, 12:19 AMGrandad
Hello chengbinThe possible scores are:

- one 4 and two 1's. The number of ways of choosing which of the three dice shows the 4 is .
- one 3, one 2 and one 1. The three dice can be arranged to show these scores in ways.
- three 2's. There is no choice involved; all the dice must show the same number. This can be done in (or ) ways.

Thus .

LaTeX answer: enclose ^3C_1 in {...}

Grandad