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tonyekwelu tonyekwelu
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10 years ago
If four students enter a classroom that has 10 vacant seats, in how many ways can they be seated?

Which of the following formulas do I use.  
Factorial
Permutation of n objects take r at a time nPr= n!/(n-r)!
Combination of n objects taken r at a time nCr = n!/r!(n-r)!

Please help.  Slight Smile

If I choose nPr = 5040 different ways.  That seems so much is it correct?
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#1
10 years ago
Your answer is correct.  It's a permutation question, because a different ordering of people in the same four seats counts as a different arrangement.
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