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=\(\frac{n!}{r!(n-r)!}\)
13 things choose 6
13C6=\(\frac{13!}{6!(13-6)!}\)=
\(\frac{13!}{6!(7)!}\)=
\(\frac{13*12*11*10*9*8}{6!}\)=
\(\frac{13*12*11*10*9*8}{6*5*4*3*2*1}\)=
\(\frac{13*2*11*2*3}{1}\)=
1716 ways
