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question about combinations and permusation

This topic has 6 expert replies and 2 member replies
svbla Newbie | Next Rank: 10 Posts
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question about combinations and permusation

Post Fri Apr 01, 2016 12:28 pm
I have two questions don't get it. can someone explain here? thanks!


5. How many different four-letter passwords can be created for a software access if no letter can be used more than once?

6.How many different ways you can elect a Chairman and Co-Chairman of a committee if you have 10 people to choose from.

my answer were:
5: 26C4
6: 10C2

because I don't think the order matters here, it didn't say anything about orders!
well the correct answers are 26P4 and 10P2.

Can someone explain it to me why the order matters in these two questions??
Thanks!!

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Post Mon Jun 19, 2017 3:22 am
ceilidh.erickson wrote:
Matt@VeritasPrep wrote:
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink
Are you assuming their gender?

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Post Wed Jun 21, 2017 4:25 pm
elias.latour.apex wrote:
ceilidh.erickson wrote:
Matt@VeritasPrep wrote:
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink
Are you assuming their gender?
You know, I pondered that riff myself, but I couldn't find any languages/cultures in which Mark and Dave were female names. (You'd think Davé would be a female name somewhere, but I couldn't find it.)

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Post Mon Jun 19, 2017 3:22 am
ceilidh.erickson wrote:
Matt@VeritasPrep wrote:
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink
Are you assuming their gender?

_________________
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Verbal Specialist @ ApexGMAT
blog.apexgmat.com
+1 (646) 736-7622

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Post Wed Jun 21, 2017 4:25 pm
elias.latour.apex wrote:
ceilidh.erickson wrote:
Matt@VeritasPrep wrote:
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink
Are you assuming their gender?
You know, I pondered that riff myself, but I couldn't find any languages/cultures in which Mark and Dave were female names. (You'd think Davé would be a female name somewhere, but I couldn't find it.)

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Post Thu Jun 22, 2017 3:54 am
Matt@VeritasPrep wrote:
elias.latour.apex wrote:
ceilidh.erickson wrote:
Matt@VeritasPrep wrote:
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink
Are you assuming their gender?
You know, I pondered that riff myself, but I couldn't find any languages/cultures in which Mark and Dave were female names. (You'd think Davé would be a female name somewhere, but I couldn't find it.)
You're mistaken because you are confusing gender with sex. They are not the same. Dave could easily be a pre-op transgender woman trapped in a man's body.

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blog.apexgmat.com
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Post Mon Jun 05, 2017 11:56 pm
ceilidh.erickson wrote:
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink
Hey, if they're chairman and co-chairman of, say, the Flat Earth Society, I'd think we want the most problematic leadership possible. ó‿ó

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Post Mon Jun 05, 2017 6:35 pm
Matt@VeritasPrep wrote:
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile
Hm, yes - I'd say that a lot of the problems in the world come down to all-male leadership teams Wink

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Harvard Graduate School of Education


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Post Thu May 11, 2017 8:24 pm
The order definitely matters! If Mark is the chairman and Dave is the co-chairman, we've got a different leadership team than we'd have if Dave is the chairman and Mark is the co-chairman: in the first case, Mark has final say, but in the second, Dave does.

So many of the problems in the world come down to this, don't they? Smile

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