1) 6 boys and 2 girls are seated in a row for a photograph. Then the probability that the girls are not together is:

       A) 1/3

       B) 1/2

       C) 1/4

       D) 3/4

2) The probability that a leap year has 53 sundays is :

       A) 1/7

       B) 2/7

       C) 3/7

       D) 4/7

3) If boys and girls are equally likely, then out of 600 families of 3 children, the number of families having all girls is :

     A) 400

     B) 300

     C) 225

     D) 75

4) One bag contains 4 white and 5 black balls. Another bad contains 6 white and 7 black balls. A ball is transferred from the first bad to the second bag. The probabiliry that the ball drawn is white is :

     A) 4/63

     B) 15/63

     C) 29/63

     D) None of these.