What is the probability of getting a sum of 2 when two dice are thrown?
Probabilities for the two dice
|Total||Number of combinations||Probability|
What is the probability of getting a sum of 9 when rolling 2 dice?
The probability of getting 9 as the sum when 2 dice are thrown is 1/9.
What is the probability of rolling two dice and getting a sum of 7?
For each of the possible outcomes add the numbers on the two dice and count how many times this sum is 7. If you do so you will find that the sum is 7 for 6 of the possible outcomes. Thus the sum is a 7 in 6 of the 36 outcomes and hence the probability of rolling a 7 is 6/36 = 1/6.
What is the probability of getting 1 and 5 If a dice is thrown once?
So they are mutually exclusive events, therefore their probabilities add to 1. By symmetry we expect that each face is equally likely to appear and so each has probability = 1/6. The outcome of a 5 is one of those events and so has probability = 1/6 of appearing.
How many combinations are there with 2 dice?
When two dice are rolled, there are now 36 different and unique ways the dice can come up. This figure is arrived at by multiplying the number of ways the first die can come up (six) by the number of ways the second die can come up (six).