$A$ lot consists of $12$ good pencils,$6$ with minor defects,and $2$ with major defects. $A$ pencil is chosen at random. The probability that this pencil is not defective is
- A$\frac{3}{5}$
- B$\frac{3}{10}$
- C$\frac{4}{5}$
- D$\frac{1}{2}$
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