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gmat prep test

This topic has 1 member reply
yvonne12 Master | Next Rank: 500 Posts Default Avatar
Joined
07 Feb 2007
Posted:
144 messages

gmat prep test

Post Wed Mar 07, 2007 8:54 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    acertain company has 18 equally qualified applicants for 4 open positions. how many different groups of 4 applicants can be chosen by the company to fill the positions if the order of selections does not matter?

    ans.3060

    please explain

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    ssiva Junior | Next Rank: 30 Posts Default Avatar
    Joined
    13 Feb 2007
    Posted:
    16 messages
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    Post Wed Mar 07, 2007 10:24 am
    The formula is (n!)/[(n-r)! * r!] for a combination problem

    18!/[(14!)(4!)] = (18*17*16*15)/(1*2*3*4) = 3060

    Thanked by: qduong

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