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AP EAMCET201920 Apr 2019Evening ShiftMathematicsProbabilityActual

Each of the two boxes A and B contain 10 chits numbered 1 to 10 . If one chit is drawn at random from each of A and B , then the probability that the number on the chit drawn from A is smaller than the number on the chit drawn from B , is

Options

  1. A9 10
  2. B9 20
  3. C19 20
  4. D17 20

Correct answer

B. 9 20

Step-by-step solution

According to the given information, If drawn number from A is 1 , then the favourable drawn number from B are 2,3,4, 10 , are total 9 cases. Similarly, for 2 , there are 8 cases and so on. aligned Required probability & = 9+8+7+ +2+1 10 10 & = 9 5 10 10 = 9 20 aligned Hence, option (b) is correct.

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