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1-(Binomial[10,0]*Binomial[990,100] +Binomial[10,1]*Binomial[990,99] +Binomial[10,2]*Binomial[990,98]+Binomial[10,3]*Binomial[990,97] +Binomial[10,4]*Binomial[990,96] )/ Binomial[1000,100]
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