Selecting 5 students at a time, x students can be arranged : Quant Question Archive [LOCKED]
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# Selecting 5 students at a time, x students can be arranged

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

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08 Feb 2005, 22:10
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
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09 Feb 2005, 05:42
HongHu plz explain.
SVP
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09 Feb 2005, 06:55
Is this correct that P(m,n)=C(m,n)*n!?
VP
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09 Feb 2005, 08:58

We know nPr = nCr * r!

So xC5 = 30240/5!
Intern
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09 Feb 2005, 11:03
Director
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09 Feb 2005, 13:59
"How many groups can be created selecting the same students at a time."
Can somebody explain?
VP
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09 Feb 2005, 14:22
nocilis wrote:
"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
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09 Feb 2005, 16:14
Thanks Banerjee
Is is group of 5? That part is still not clear to me.
09 Feb 2005, 16:14
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