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jeffn
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can someone help me with this ques : There are 5 couples, 1 man & 1 woman are selected in random, whats the probability they are married. : why can’t we do this 10c1*1/10c2 (i.e 2/9)

implying ^ selecting 1 out of any 10 people, their partner can be selected in only 1 way so 10c1*1 out of total being 10c2
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Quote:

*rak08 writes:*
can someone help me with this ques : There are 5 couples, 1 man & 1 woman are selected in random, whats the probability they are married. : why can’t we do this 10c1*1/10c2 (i.e 2/9)
1/5 ?
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yeah i know but i was thinking a way to have p&c too in it
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Quote:

*rak08 writes:*
implying ^ selecting 1 out of any 10 people, their partner can be selected in only 1 way so 10c1*1 out of total being 10c2
If u will do by 10C2 then there are few cases when both selected are men’s or women’s
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yeah so our total will include that

favorable will have no such case
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*rak08 writes:*
yeah so our total will include that
But we have to select 1 M and 1 W. This is condition of question
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ohh okay got it! thanks! yes
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Hello everyone :)! Here is today’s (May 7) DI Butler Question: from-the-answer-choices-below-select-values-that-could-work-for-the-u-444888.html#p3566610
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Hey I personally find that question in my gmac mock very close answer choice but in gmat club question are different, my accuracy is pretty good then why I mess up in mocks
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Fresh Data Sufficiency questions to practice:

#Link
1Question 1
2Question 2
3Question 3
4Question 4
5Question 5
6Question 6
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how to solve questions involving unfair dice ?? its super confusing at times
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How to solve the below question?
A certain club has 20 members. What is the ratio of the number of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?

A. 16 to 1
B. 15 to 1
C. 16 to 5
D. 15 to 6
E. 5 to 4
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Yessss
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yes
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Yes
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