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
None of these
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
None of these
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 ?
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
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:
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
A speaks truth in 75% cases and B speaks truth in 80% cases, The probability that they contradict each other in a statement, is