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There are two balls in an urn. Each ball can be either white or black. If a white ball is put into the urn and there after a ball is drawn at random from the urn, then the probability that it is white is

Options

  1. A1 4
  2. B2 3
  3. C1 5
  4. D1 3

Correct answer

B. 2 3

Step-by-step solution

Total possible event when one ball is taken out = ^3 C ₁ Let E : The event of 1 white ball coming out No. of ways to 1 white ball coming out = ^2 C ₁ P(E)= ^2 C₁ ^3 C₁ = 2 3

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