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Mathematics 7 Online
OpenStudy (anonymous):

13 P 0

OpenStudy (anonymous):

@campbell_st

OpenStudy (anonymous):

its a proportion

OpenStudy (campbell_st):

well its a straight up calculator question... do you have a calculator that does permutations...?

OpenStudy (anonymous):

i dont....

OpenStudy (campbell_st):

ok... so here is the formula \[^{n}P_{k} = \frac{n!}{(n - k)!}\] so in your question n = 13 and k = 0 so you have \[^{13}P_{0} = \frac{13!}{(13 - 0)!} = 1\] hope this helps.

OpenStudy (anonymous):

so if you have 13 C 12, how do you set that up?

OpenStudy (campbell_st):

factorial notation is \[n! = 1 \times 2 \times 3 \times 4\times 5 \times.... \times n\] so as an example \[3! = 1 \times 2 \times 3 = 6\] \[4! = 1 \times 2 \times 3 \times 4 = 24\] \[5! = 1 \times 2\times 3 \times 4 \times 5 = 60\]

OpenStudy (anonymous):

so in my equation is n! = 13

OpenStudy (anonymous):

or do you multiply 13 * 12 and then find the divisibility?

OpenStudy (campbell_st):

ok... so this is a combination the combination formula is slightly different. \[^{n}C_{r} = \frac{n!}{r!(n - r)!} \] in your question you have \[^{13}C_{12} = \frac{ 13!}{12!(13-12)!} = 13\]

OpenStudy (anonymous):

OH!!!! i get it now

OpenStudy (campbell_st):

glad to help

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