A bag contains 3 black and 4 white balls. Two balls are drawn one

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 Multiple Choice QuestionsMultiple Choice Questions

651.

One ticket is selected at random from 100 tickets numbered 00, 01, 02,..., 98, 99. If x1 and x2 denote the sum and product of the digits on the tickets, then P(x1 = 9/x2 = 0) is equal to

  • 150

  • 219

  • 19100

  • None of these


652.

A four-digit number is formed by the digits 1, 2, 3, 4 with no repetition. The probability that the number is odd, is

  • zero

  • 13

  • 14

  • None of these


653.

A die is rolled twice and the sum of the numbers appearing on them is observed to be 7. What is the conditional probability that the number 2 has appered atleast once ?

  • 12

  • 13

  • 23

  • 25


654.

A manufacturer of cotter pins knows that 5% of his product is defective. He sells pins in boxes of 100 and guarantees that not more than one pin will be defective in a box. In order to find the probability that a box will fail to meet the guaranteed quality, the probability distribution one has to employ is

  • binomial

  • poisson

  • normal

  • exponential


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655.

Probability of getting positive integral roots of the equation x - n = 0 for the integer n, 1  n  40 is

  • 15

  • 110

  • 320

  • 120


656.

A box contains 9 tickets numbered 1 to 9 inclusive. If 3 tickets are drawn from the box one at a time, the probability that they are alternatively either {odd, even, odd} or {even, odd, even}is:

  • 517

  • 417

  • 516

  • 518


657.

If PA = 112, PB = 512 and PBA = 115, then P(A B) is equal to :

  • 89180

  • 90180

  • 91180

  • 92180


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658.

A bag contains 3 black and 4 white balls. Two balls are drawn one by one at random without replacement. The probability that the second drawn ball is white, is

  • 449

  • 17

  • 47

  • 1249


C.

47

Required probability         = 37 × 46 + 47 × 36         = 12 + 1242         = 2442 = 47


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659.

A coin is tossed 4 times. The probability that atleast one head turns up 1s

  • 116

  • 216

  • 1416

  • 1516


660.

A speaks truth in 75% cases and B speaks truth in 80% cases, The probability that they contradict each other in a statement, is

  • 720

  • 1320

  • 35

  • 25


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