Probability

Bag contains red and black balls, while another bag contains red and black balls. One ball is drawn at random from one of the bags and it is found to be black. The probability that it was drawn from bag is

Three cards are drawn successively without replacement from a pack of well shuffled cards. The probability that first two cards are queens and the third card is a king, is

A fair coin is tossed number of times. If the probability of having at least one head is more than 90%, then is greater than or equal to

A fair die is rolled. Consider the events A = { }, B = { } and C = { }. Then, the conditional probability is