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Bag contain 10 back and 20 white balls, One ball is drawn at random. What is the probability that ball is white

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  • 2/3
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4. Bag contain 10 back and 20 white balls, One ball is drawn at random. What is the probability that ball is white

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5. Two unbiased coins are tossed. What is probability of getting at most one tail ?

  • \begin{aligned} \frac{1}{2} \end{aligned}
  • \begin{aligned} \frac{1}{3} \end{aligned}
  • \begin{aligned} \frac{3}{2} \end{aligned}
  • \begin{aligned} \frac{3}{4} \end{aligned}
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