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Amrabdelnaby
- Master | Next Rank: 500 Posts
- Posts: 137
- Joined: Fri Nov 13, 2015 11:01 am
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I'm little confused about something here.
In the following questions my answers did not tally when i solved it using both combinations and probabii=lity methods.
the question is as follows:
1. Jim and John are workers in a department that has a total of six employees. Their boss decides that two workers from the department will be picked at random to participate in a company interview. What is the probability that both Jim and John are chosen?
A. 1/5
B. 1/6
C. 1/30
D. 1/15
E. 11/30
Combinations: (6C1 x 5C1)/6C2 = 1/15
probability: P(john & jean) = p(john) x P(jean given that john was selected) = 1/6 x 1/5 = 1/30
Can you please tell me what did i do wrong here?
Thanks
In the following questions my answers did not tally when i solved it using both combinations and probabii=lity methods.
the question is as follows:
1. Jim and John are workers in a department that has a total of six employees. Their boss decides that two workers from the department will be picked at random to participate in a company interview. What is the probability that both Jim and John are chosen?
A. 1/5
B. 1/6
C. 1/30
D. 1/15
E. 11/30
Combinations: (6C1 x 5C1)/6C2 = 1/15
probability: P(john & jean) = p(john) x P(jean given that john was selected) = 1/6 x 1/5 = 1/30
Can you please tell me what did i do wrong here?
Thanks
