Find the answers 

1. The probability of getting heads in both trials, when a balanced coin is tossed twice will be

(a)   1/4

(b)  1/2

(c)  1

(d)   3/4

2. Two cards are drawn at random from a pack of 52 cards. The probability of these two being aces is

(a) 1/26 

(b)  1/221

(c)  1/2

(d)  None of these

3. The probability that a leap year selected at random contains 53 Sundays is

(a) 7/366                   (b) 26/183                   (c) 1/7                          (d) 2/7

4. The probability of getting more than 7 when pair of dice is thrown is:

          (a) 7/36                     (b) 7/12                       (c) 5/12                           (d) None of these

5. The probability of having at least one head in 3 throws with a coin is:

          (a) 7/8                                (b) 318                        (c) 1/8                            (d) None of these

6. If A and B are independent events, then P (A ) equals.

        (a) P (A) + P (B)        (b) P (A) P (B)      (c) P (A/B)       (d) P (B/A)

7.If A and B are mutually exclusive events. Then P (A ) equals.

(a) 0                         (b)    2                         (c) 1                                (d) none of these

8. 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 balls drawn is blue?

(a) 10/21 (b) 11/21 (c) 2/7 (d) 5/7

9.A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag.    The probability that all of them are red is:

(a) 2/91 (b)1/22 (c) 3/22 (d) 2/77