$A$ bag contains $10$ identical pens,of which $4$ are red and $6$ are blue. $3$ pens are taken out at random one after another. Find the probability that all $3$ are blue.
- A$\frac{6}{10}$
- B$\frac{3}{10}$
- C$\frac{1}{6}$
- D$\frac{3}{6}$
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