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Permutations in Probability

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There are 10 workers and 2 administrators in a company meeting room. Two people will be selected at random without replacement. The chance that the second person is a worker is:

a. none of these

b. 15/66

c. 5/6

d. 5/33

e. 10/11

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The expert examines permutations in probability.

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Here is my explanation:

The total combinations: 12P2 = 12 * 11 = ...

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