1680 to get this answer you need to get the factorial of 8 and the factorial of 4!
like so 8! is n! 8*7*6*5*4*3*2*1=n!_40320
4! is r! 4*3*2*1=r!_24
now divide the two!
n!/r!(n-r)!=1680
8!/4!(8-4)!=1680
8!/4!=1680
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