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The numbers get large extremely fast, so it only gets to about 170 digits before it just says Infinity. Factorial notation is shown as the symbol ! x! = x*(x-1)*(x-2)*...*(2)*1 So, 5! = 5*4*3*2*1 = 120, and 7! 7*6*5*4*3*2*1 = 5040
