An urn contains 3 white, 4 red and 5 black balls. Two balls are drawn one by one without replacement. What i the probability that iat least one ball is black.

An urn contains 3 white, 4 red and 5 black balls. Two balls are drawn one by one without replacement. What i the probability that iat least one ball is black.

Matching exercise

Match the items on the right to the items on the left.

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

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