Two number are successively drawn from the set U={1,2,3,4,5,6,7,8} the second being drawn without replacing the first. The number of elementary event in the sample is:

Two numbers are successively drawn from the set {1, 2, 3, 4, 5, 6, 7} without replacement and the outcomes recorded in that order. What is the number of elementary events in the random experiment ?

Two numbers are chosen from {1, 2, 3, 4, 5, 6, 7, 8} one after another without replacement. Then the probability that

Two numbers are chosen from {1, 2, 3, 4, 5, 6, 7, 8} one after another without replacement. Then the probability that

From the set of numbers {1,2,3,4,5,6,7,8} two numbers are selected at random without replacement.The probability that their sum is more than 13 is

Two cards are drawn successively with replacement . The mean of number of Aces is

Two cards are drawn successively with replacement . The mean of number of Aces is

A box contains 5 red and 4 white marbles.Two marbles are drawn successively from the box without replacement and the second drawn marble drawn is found to be white.Probability that the first marble is also white is

A bag contains 21 markers with numbers 1 to 21. A maker is drawn at random and then replaced and then a second marker is drawn. The probability that the first number is odd and the second is even is

A bag contains 21 markers with numbers 1 to 21. A maker is drawn at random and then replaced and then a second marker is drawn. The probability that the first number is odd and the second is even is