200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)

问题描述:

200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)

200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
=200*(1/2*2/3*3/4*……*99/100)
=200*1/100
=2