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  • Provide solution for RD Sharma maths class 12 chapter 31 Mean and Variance of a Random Variable exercise 31.1 question 31 maths textbook solution

Provide solution for RD Sharma maths class 12 chapter 31 Mean and Variance of a Random Variable exercise 31.1 question 31 maths textbook solution

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Answer: \frac{4}{19}

Hint: use probability concept.

Given: a bag contains 19 tickets numbered from 1 to 19. A ticket is drawn and then another ticket is drawn without replacement. The probability that both the tickets will show even number on the ticket is

Solution: the probability of getting an even number in first draw =\frac{9}{19}. The probability of getting an even number in second draw =\frac{8}{18}

Both are independent event and so required probability =\frac{9}{19}\times \frac{8}{18}==\frac{4}{19}

 

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