Q1. Six balls are put in three boxes. The probability of putting balls in the boxes in equal number is
a. 1/8
b. 1/18
c. 1/28
d. None of these

Q2. In a classroom, five girls and three boys are seated randomly in the same row. The probability that no boy sits between two girls is ?
a. (3! * 5!)/8!
b. (5! – 3!)/8!
c. (4!*5!)/8!
d. None of these

Q3. Let X and Y be two independent events in such a way that their probabilities are 3/10 and 2/5 respectively. The probability of exactly one of the event happening is
a. 25/30
b. 1/2
c. 31/50
d. None of these

Q4. The co-ordinate of the vertices of a traingle are(0, 0), (6, 0), (0, 4). What is the probability that the point which is selected inside the triangle will have its x coordinate less its y coordinate ?
a. 1/2
b. 2/5
c. 3/5
d. 5/7

Q5. Let P ={2, 3, 4. . . . . . . . ., 20, 21}
A number is chosen at random from the set P and it is found to be a prime number. The probability that it is more than 10 is :
a. 9/10
b. 1/10
c. 1/5
d. None of these

Q6. A pair of dice are rolled together till the sum of either 5 or 7 is obtained.
The probability that 5 comes before 7 is
a. 0.45
b. 0.4
c. 0.4
d. 0.6