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anonymous
 one year ago
We have a box with 8 balls numbered: 0,0,0,1,1,1,2,2 we pick three balls together respectively, what's the prospect that the combination of the numbers of the balls we picked is 5 ?
anonymous
 one year ago
We have a box with 8 balls numbered: 0,0,0,1,1,1,2,2 we pick three balls together respectively, what's the prospect that the combination of the numbers of the balls we picked is 5 ?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Knowing that the balls are shapely matched and we can't see them in the box

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0how many ways can we get a sum of 5 with 3 balls?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0one way is 2,2 and one of the 1's right?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0there are 3 balls marked 1 so the total number of ways to get 5 is 3.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0There's actually only 1 way to get 5 because we pick up the ball, check out it's number and throw it away

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1First, you need to find how many ways you can pick 3 balls that add up to 5. To have a sum of 5 with three balls, you must have the two balls labeled 2. That adds up to 4. Then you need a ball labeled 1. Since there are 3 balls labeled 1, there are 3 ways of picking 3 balls that add up to 5. Now you need to find how many ways there are of picking 3 balls out of 10 balls. For the first pick, you can choose from 8 balls. The second pick is out of 7 balls. The third pick is out of 6 balls. There are 8 * 7 * 6 = 336 ways of picking 3 balls. Of the 336 ways of picking 3 balls, 5 ways result in a sum of 5. P(sum of 5 with 3 balls) = 5/336

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The answer for P(sum of 5 with 3 balls) = 2/8 *1/7 *3/6 *3= 18/336 wanna know why that's the answer ?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Yes, you are correct. You do need 2, 2, 1, but there are 18 ways of arranging those numbers. Since you need 2, 2, 1, the first 2 is 2 out of 8. The next 2 is 1 out of 7, then the 1 is 3 out of 6. Finally, once you have those picks, you can arrange them in 3 different ways. 2/8 * 1/7 * 3/6 * 3 = 18/336 = 3/56

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Thanks for pointing it out.
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