x=1:10^8#10^8 trials
sample(x=x,size=5)#choose 5 samples from 10^8 trials
sample(x=x,size=10)#choose 10 samples from 10^8 trials
sample(x=x,size=20)#choose 20 samples from 10^8 trials
choose(10^8,5)#P[C5]from 10^8 trials
choose(10^8,10)#P[C10]from 10^8 trials
choose(10^8,20)#P[C20]from 10^8 trials
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