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10 members of a society, including members A and B, attended a meeting
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12 Oct 2021, 09:54
12 Oct 2021, 09:54
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10 members of a society, including members A and B, attended a meeting. 2 of these members were selected to form a committee. What is the probability that the 2 members selected were members A and B?
A. 1/10
B. 1/15
C. 1/20
D. 1/30
E. 1/45
A. 1/10
B. 1/15
C. 1/20
D. 1/30
E. 1/45
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Re: 10 members of a society, including members A and B, attended a meeting
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12 Oct 2021, 09:58
12 Oct 2021, 09:58
1
Carcass wrote:
10 members of a society, including members A and B, attended a meeting. 2 of these members were selected to form a committee. What is the probability that the 2 members selected were members A and B?
A. 1/10
B. 1/15
C. 1/20
D. 1/30
E. 1/45
A. 1/10
B. 1/15
C. 1/20
D. 1/30
E. 1/45
Let's apply some probability rules
P(A and B both selected) = P(1st selection is one member of the pair AND 2nd selection is the other member of the pair)
= P(1st selection is one one member of the pair) x P(2nd selection is the other member of the pair)
= 2/10 x 1/9
= 1/45
Answer: E
gmatclubot
Re: 10 members of a society, including members A and B, attended a meeting [#permalink]
12 Oct 2021, 09:58
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