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

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Senior Manager
Joined: 02 Mar 2004
Posts: 327
Location: There
From 10 people, select 1 person to make president, and then [#permalink]

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16 May 2004, 12:30
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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
Joined: 23 Sep 2003
Posts: 293
Location: US

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17 May 2004, 08:56
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
17 May 2004, 08:56
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