An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are black?

  A speaks truth in 60% cases and B in 90% cases. In what percentage of cases are they likely to contradict each other in stating the same fact.

  An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are white?

  Three groups of children contain respectively 3 girls and 1 boy; 2 girls and 2 boys; 1 girl and 2 boys. One child is selected at random from each group. The probability that the three selected consist of 1 girl and 2 boys is.

  Evaluate P(AUB), if 2(P(A)=P(B)=5/13 and P(A/B)=2/5

  Arun and Tarun appear for an interview for two vacancies. The probability of Arun’s selection is 1/3 and that of Tarun’s selection is 1/5. Find the probability that only one of them will be selected.

  In a school, there are 1000 students, out of which 430 are girls. It is known that out of 430, 10% of the girl students study in class XII. What is the probability that a student chosen randomly studies in class XII, given that the chosen student is a girl?

  A letter is known to have come from either TATANAGAR or CALCUTTA. On the envelope, just two consecutive letters. TA are visible. Find the probability that the letter has come form CALCUTTA.

  Events A and B are S.t P(A)=1/2 P(B)= 7/12 and P( not A or not B)= ¼ State whether A and B are independent.

  .