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# Selecting 5 students at a time, x students can be arranged

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VP
Joined: 25 Nov 2004
Posts: 1486
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Kudos [?]: 104 [0], given: 0

Selecting 5 students at a time, x students can be arranged [#permalink]

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08 Feb 2005, 23:10
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Selecting 5 students at a time, x students can be arranged in 30240 ways. How many groups can be created selecting the same students at a time.
Manager
Joined: 01 Jan 2005
Posts: 166
Location: NJ
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09 Feb 2005, 06:42
HongHu plz explain.
SVP
Joined: 03 Jan 2005
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09 Feb 2005, 07:55
Is this correct that P(m,n)=C(m,n)*n!?
VP
Joined: 18 Nov 2004
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09 Feb 2005, 09:58
Given.....xP5 = 30240....asking xC5

We know nPr = nCr * r!

So xC5 = 30240/5!
Intern
Joined: 27 Dec 2004
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09 Feb 2005, 12:03
same answer from me too.
Director
Joined: 19 Nov 2004
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09 Feb 2005, 14:59
I don't follow this:
"How many groups can be created selecting the same students at a time."
Can somebody explain?
VP
Joined: 18 Nov 2004
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09 Feb 2005, 15:22
nocilis wrote:
I don't follow this:
"How many groups can be created selecting the same students at a time."
Can somebody explain?

First part is abt arranging 5 students at a time e.g. arranging them in a row, where order matters so it XP5....second it is creating gps of 5, no order is necessary...so combination i.e. XC5
Director
Joined: 19 Nov 2004
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09 Feb 2005, 17:14
Thanks Banerjee
Is is group of 5? That part is still not clear to me.
09 Feb 2005, 17:14
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# Selecting 5 students at a time, x students can be arranged

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