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
The probability of getting at least one tail in 4 throws of a coin is
15/26
15/16
1/4
1/8
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
Total probability of an event =
0
0.5
0.75
1
If A and B are two independent events then the value of P(A/B ) is
P(A)
P(B)
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
2/7
5/7
The probability that a leap year will contain 53 Sundays is
4/7
1/7
A bag contains 20 coloured balls.8 are red,6 are blue,3 are green,2 are white and 1 is brown.A ball is chosen atrandom from the bag.What is the probability that the ball chosen is blue or red?
6/20
8/20
14/20
One card is drawn at random from a pack of 52 cards .What is the probability that the cards drawn is a face card (Jack, Queen , and king only ?
1/13
3/13
9/52
Two dice are thrown simultaneously ,then the probability of getting an even number as the sum is
1/3