26.A fair coin is tossed 10 times. The probability that the coin shows head exactly 4 times, is

27.Three identical dice are rolled. The probability that the same number will appear on each of them, is

28.A coin is tossed three times in succession. If E is the event that there are at least two heads and F is the event in which first throw is a head, then P(E/F) =

29.A pack of cards contains 4 aces, 4 kings, 4 queens and 4 jacks. Two cards are drawn at random from this pack without replacement. The probability that at least one of them will be an ace, is