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anonymous
 5 years ago
two number cubes are rolled. what is the probability that the sum will be even
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anonymous
 5 years ago
two number cubes are rolled. what is the probability that the sum will be even ?

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sandra
 5 years ago
Best ResponseYou've already chosen the best response.0ok so the probability of something occurring is always (#cases where event occurs)/(#total number of possible cases)

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0so in the case of dice, there are 36 possible roles of the dice (6 possiblities for the first , and 6 possibilities for the second  so 6 x 6)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0alright. which is 36?

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0so by brute force, you can actually list all of the combinations, and then count the number that are even: Dice 1, Dice 2, Sum, Odd/even 1. 1, 1, 1+1=2, even 2. 1, 2, 1+2=3, odd 3. 1, 3, 1+3=4, even and so on... until you've listed all 36

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0and then the answer is the number of even possibilities/36

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0you were correct  there are 36 possible combinations when you roll a dice

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so 36 possible even number? 6/36?

sandra
 5 years ago
Best ResponseYou've already chosen the best response.01 and 1, 1 and 2, 1 and 3, and so on. But since you know that the number of possiblities for each individual dice is 6, the total number of possibilities when you roll two of them is 6 x 6 = 36

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0now you want to know, out of those 36 possible combinations, how many add up to be an even number?

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0you can brute force the solution by listing them all, and their sums, and know that the probability is #evensums/36

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yea. probability some will be even

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0hmm, the question said "sum", not "some"

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0so a sum is even when you add an even and an even, OR an odd and an odd

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0when you add two even numbers together you get an even sum and when you add two odd nubers together you gat an even sum otherwise it is odd.

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0great minds think alike =)

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0so what's the probability that both are even numbers? Well, since there's 3/6 chance for the first dice being even, and 3/6 chance the second dice is even, there's a 3/6 * 3/6 = 1/4 chance of both being even

sandra
 5 years ago
Best ResponseYou've already chosen the best response.0what's the probability of them both being odd?
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