If two coins are tossed once. What is the probability of getting at least one head?
1/4
2/4
3/4
1
If P(B)= 3/4 ,
1/6
1/9
1/12
1/15
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
In a school of 50 students there are 35 girls and rest are boys.Then the probability that a selected student will be a boy is
3/10
1/5
7/5
4/5
The probability of getting at least one tail in 4 throws of a coin is
15/26
15/16
1/8
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
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 ?
4/7
3/7
Three houses are available in a locality .Three persons apply for the houses .Each applies for one house with out consulting the others.The probability that all three apply for the same house is
2/9
3/9
5/9
The probability that a leap year will contain 53 Sundays is
5/7
2/7
1/7
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 .
7/19
1/3
8/21