$A$ bag contains $4$ white,$5$ black and $6$ red balls. If a ball is drawn at random,then what is the probability that the drawn ball is either white or red?

  • A
    $\frac{4}{15}$
  • B
    $\frac{1}{2}$
  • C
    $\frac{2}{5}$
  • D
    $\frac{2}{3}$

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