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Two balls are drawn at random without replacement. What is the probability

that the sum of the numbers on the two balls is 1?

The answer is 20/90 but what is the procedure to solve this problem?

Probably of First Draw:

1 - (8/10) = 2/10

Probability of Second Draw:

1 - (6/8) = 2/8

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# Homework Help: Probability problem without replacement

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