$A$ bag contains $9$ discs of which $4$ are red,$3$ are blue and $2$ are yellow. The discs are similar in shape and size. $A$ disc is drawn at random from the bag. Calculate the probability that it will be not blue.
- A$\frac{1}{3}$
- B$\frac{2}{3}$
- C$\frac{4}{9}$
- D$\frac{5}{9}$
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