Theorem of total probability - class-XI

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There are 50 marbles of 3 colors: blue yellow and black The probability of picking up a blue marble is 3/10 and that of picking up a yellow marble is 1/2 The probability of picking up a black ball is 

  1. 1/5
  2. 1/10
  3. 1/4
  4. 4/5
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