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permutation and combination

0 votes
5p3 answer given - 5*4*3 =60

My question is why 3 is also taken here .

I think the answer should be 20 because

5*4*3/3*2*1
asked Aug 1, 2017 in Math by sophie

1 Answer

0 votes
5P3 is an example of nCr which is DEFINED as n! / (n-r)!

In this case, 5! / 2! has the 5•4•3 expansion...it's 5! but with the 2•1 having cancelled the last two factors of 5!

Answer 60 is entirely correct.
answered Aug 1, 2017 by admin (2,270 points)
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