GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
A box contains 10 pairs of shoes (20 shoes in total). If two
[#permalink]
19 Nov 2019, 11:06
19 Nov 2019, 11:06
2
Bookmarks
00:00
Question Stats:
65% (00:52) correct
35% (01:16) wrong based on 40 sessions
Hide Show timer Statistics
A box contains 10 pairs of shoes (20 shoes in total). If two shoes are selected at random, what is the probability that they are matching shoes?
[A] \(\frac{1}{190}\)
[B] \(\frac{1}{20}\)
[C] \(\frac{1}{19}\)
[D] \(\frac{1}{10}\)
[E] \(\frac{1}{9}\)
[A] \(\frac{1}{190}\)
[B] \(\frac{1}{20}\)
[C] \(\frac{1}{19}\)
[D] \(\frac{1}{10}\)
[E] \(\frac{1}{9}\)
Re: A box contains 10 pairs of shoes (20 shoes in total). If two
[#permalink]
22 Nov 2019, 11:47
22 Nov 2019, 11:47
2
Expert Reply
probability to choose any shoe out of 20 is 20/20
probability to choose its pair is 1 out of 19 i.e 1/19.
thus (20/20)*(1/19) = 1/19
probability to choose its pair is 1 out of 19 i.e 1/19.
thus (20/20)*(1/19) = 1/19
Re: A box contains 10 pairs of shoes (20 shoes in total). If two
[#permalink]
15 Jan 2024, 07:26
15 Jan 2024, 07:26
favorable outcomes/ total outcomes
Favorable outcomes = 10C1 (10 pairs and we select 1 out of 10)
total outcomes = 20C2 = 190
=10/190 = 1/19
Favorable outcomes = 10C1 (10 pairs and we select 1 out of 10)
total outcomes = 20C2 = 190
=10/190 = 1/19
