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From a box containing 20 tickets marked with numbers 1 to 20, four tickets are drawn one by one. After each draw, the ticket is replaced. The probabil

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From a box containing 20 tickets marked with numbers 1 to 20, four tickets are drawn one by one. After each draw, the ticket is replaced. The probability that the largest value of tickets drawn is 15 is. A. ( 3 4 )4 B. 27 320 C. 27 1280 D. none of these Select the correct answer from above options

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Correct Answer - B We,have Probability of drawing a ticket bearing number 15is 1 20 . Probability of drawing a ticket bearing a number less than or equal to 15is 15 20 = 3 4 . ∴ Required probability = Probability of drawing one ticket bearning number 15 and three tickets bearing numbers less than or equal to 15=.4C1× 1 20 ×( 3 4 )3= 27 320

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