There are four letters and four envelopes ,then the probability for all the letters not despatching in the right envelope is
19/24
21/23
23/24
25/26
If A and B are two independent events then the value of P(A/B) is
0
1
P(A)
P(B)
In a box,there are 8 red,7 blue and 6 green balls .One ball is picked up randomly.What is the probability that it neither red nor green .
3/4
7/19
1/3
8/21
What is the probability of getting a sum 9 from two throws of a disc ?
1/6
1/8
1/9
1/12
Ticket numbered 1 to 20 are mixed up and then a ticket is drawn at random .What is the probability that the ticket drawn has a number which is a multiple of 3 or 5 ?
1/2
2/5
8/15
9/20
Two dice are thrown simultaneously ,then the probability of getting an even number as the sum is
1/4
1/7
The probability that a leap year will contain 53 Sundays is
5/7
4/7
2/7
A bag contains 6 black and 8 white balls .One ball is drawn at random .What is the probability that the ball drawn is white ?
3/7
If P(B)= 3/4 ,
1/15
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 ?
1/21
10/21
