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A girl has 5 pairs of shoes, each pair being a different style. If she
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15 Oct 2021, 04:52
15 Oct 2021, 04:52
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Question Stats:
91% (00:40) correct
8% (00:25) wrong based on 12 sessions
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A girl has 5 pairs of shoes, each pair being a different style. If she selects 2 shoes at random, what is the probability they form a matching pair ?
A. 1/20
B. 1/10
C. 1/9
D. 1/5
E. 2/5
A. 1/20
B. 1/10
C. 1/9
D. 1/5
E. 2/5
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Joined: 10 Apr 2015
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Re: A girl has 5 pairs of shoes, each pair being a different style. If she
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15 Oct 2021, 05:23
15 Oct 2021, 05:23
1
Carcass wrote:
A girl has 5 pairs of shoes, each pair being a different style. If she selects 2 shoes at random, what is the probability they form a matching pair ?
A. 1/20
B. 1/10
C. 1/9
D. 1/5
E. 2/5
A. 1/20
B. 1/10
C. 1/9
D. 1/5
E. 2/5
P(matching pair) = P(1st shoe is ANY shoe AND 2nd shoe matches the 1st selection)
= P(1st shoe is ANY shoe) x P(2nd shoe matches the 1st selection)
= 10/10 x 1/9
= 1/9
Answer: C
gmatclubot
Re: A girl has 5 pairs of shoes, each pair being a different style. If she [#permalink]
15 Oct 2021, 05:23
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