A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective.
A). 62/63
B). 125/126
C). 1/63
D). 1/42
Three 6 faced dice are thrown together. The probability that exactly two dice show the same number on them is -.
A). 5/9
B). 5/12
C). 1/36
D). 7/12
Three 6 faced dice are thrown together. The probability that no two dice show the same number on them is -.
A). 7/12
B). 5/9
C). 1/36
D). 5/12
Three 6 faced dice are thrown together. The probability that all the three show the same number on them is -.
A). 1/216
B). 1/36
C). 5/9
D). 5/12
A basket has 5 apples and 4 oranges. Three fruits are picked at random. The probability that at least 2 apples are picked is -.
A). 25/42
B). 9/20
C). 10/23
D). 41/42