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From 10 people, select 1 person to make president, and then

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Senior Manager
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From 10 people, select 1 person to make president, and then [#permalink] New post 16 May 2004, 11:30
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From 10 people, select 1 person to make president, and then select
another person to make vice president, and finally select another
person to make deputy vice presidentn. If 1 person is selected at
random, what is the probability that the person is either a vice
president or a deputy vice president?
Senior Manager
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 [#permalink] New post 17 May 2004, 07:56
1/5?

1 president ---- prob = 1/10
1 VP ----- prob = 1/10
1 DVP ----- prob = 1/10
7 others -----prob = 7/10


Prob(VP or DVP) = 1/10 + 1/10 = 1/5
  [#permalink] 17 May 2004, 07:56
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From 10 people, select 1 person to make president, and then

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