• # question_answer Arun contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white? A)  $\frac{71}{190}$              B)       $\frac{121}{190}$ C)   $\frac{91}{190}$               D)       $\frac{93}{190}$

Total possible outcomes      $=20{{c}_{2}}\,=\frac{20\,\,\,\,\,19}{1\,\,\,\,\,\,\,2}=190$ Total favourable outcomes             $={{7}_{C1}}\,\,\,\,{{13}_{C1}}\,\,=\,\,7\,\,\,13\,\,=91$ $\therefore$ Required probability $=\frac{91}{190}$