Respuesta :

apologiabiology
remember that x! means times x ad all numbers below to 1

nCr
combiniations

out of n things, how many ways are there to choose r of them
nCr=[tex] \frac{n!}{r!(n-r)!} [/tex]

13 things choose 6

13C6=[tex] \frac{13!}{6!(13-6)!} [/tex]=
[tex] \frac{13!}{6!(7)!} [/tex]=
[tex] \frac{13*12*11*10*9*8}{6!} [/tex]=
[tex] \frac{13*12*11*10*9*8}{6*5*4*3*2*1} [/tex]=
[tex] \frac{13*2*11*2*3}{1} [/tex]=
1716 ways





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