Five red cards and four blue cards are blaced in a bag, five cards are selected blind from the bag, what is the probablity that they are all red?
2026-04-07 12:04:24.1775563464
Problem involving counting about marbles
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Possible ways to choose $5$ marbles out $5+4=9$ marbles $$\dbinom{5+4}{5}=\frac{9!}{5!4!}=126$$ Favorable ways?: only $1$. So, the probability is equal to $\frac{1}{126}$.