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
25/42
NA
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1. A bag contains 5 white, 7 red and 8 black balls. If 4 balls are drawn one by one with replacement, what is the probability that all are white ?
2. If C is non-random variable, the E(C) is
3. Mayank threw two dice simultaneously. What is the probability of getting a total of 7?
4. A bag contains 2 red, 3 green and 2 blue balls.Two balls are drawn at random.What is the probability that none of the drawn ball is blue?
5. If A and B are two events such that P (A) = 3/4, P (B) = 1/2 and P (A n B) = 3/8, find P (not A and not B).
6. A speaks truth in 75% cases and B in 80% of cases. In what percentage of cases they contradict each other in narrating the same incident?
7. A bag contains 6 white and 4 black balls. Two balls are drawn at random. Find the probability that they are of same colour.
8. If a card is drawn from a well shuffled pack of cards, the probability of drawing a spade or a king is -.
9. If four marbles are picked at random, what is the probability that one is green, two are blue and one is red ?
10. Two brother X and Y appeared for an exam. The probability of selection of X is 1/7 and that of B is 2/9. Find the probability that both of them are selected
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