Probability of an Event "A" Not to Happen

Q.

If the probability of a day being rainy is 0.75, then the probability of it not being a rainy day is ___.

1. 0.50

2. 0.75

3. 0.25

4. 0

Q.

In a cricket match, a batsman hits a boundary 6 times out of the 30 balls he plays. Find the probability of him not hitting a boundary on the balls he plays.

1. 0.2

2. 0.8

3. 0.6

4. 0.4

Q.

A jar contains 24 marbles of which some are green and others are blue. If a marble is drawn randomly from the jar, the probability that it is green is $\frac{2}{3}$. Find the probability of drawing a blue marble from the jar.

1. $\frac{1}{2}$

2. $\frac{1}{4}$

3. $\frac{2}{3}$

4. $\frac{1}{3}$

Q.

Out of all the two digit numbers, what is the probability of the number not being a perfect square?

1. $\frac{14}{15}$

2. $\frac{14}{18}$

3. $\frac{12}{15}$

4. $\frac{1}{15}$

Q.

A bag contains three green marbles, four blue marbles, and two orange marbles. If a marble is picked at random, then the probability that it is not an orange marble is

1. $\frac{1}{3}$

2. $\frac{1}{4}$

3. $\frac{4}{9}$

4. $\frac{7}{9}$

Q.

A bag contains 3 red balls, 5 black balls, and 4 white balls. A ball is drawn at random from the bag. What is the probability of not getting a black ball?

1. $\frac{1}{4}$

2. $\frac{1}{3}$.

3. $\frac{7}{12}$

4. 1

Q.

A regular hexagon is drawn with its vertices on a circle as shown in the figure. Without looking into it, if one randomly puts a dot in it, what is the probability of the dot not being in the regular hexagon?

1. $\frac{3\sqrt{3}}{\pi }$

2. $\frac{3}{2\pi }$

3. $\frac{3\sqrt{3}}{2\pi }$

4. $\frac{3\sqrt{3}}{2}$

Q.

Two dice are thrown simultaneously. What is the probability of not getting the same numbers on both the dice?

1. $\frac{1}{6}$

2. $\frac{1}{4}$

3. $\frac{5}{6}$

4. $\frac{3}{4}$

Q. The probability of a day being rainy is 0.75, then the probability of it not being a rainy day is .

1. $0.79$
2. $0.25$
3. $0.50$
4. $0.36$

Q. If the probability of an event is 0.6, then the probability of the event not happening is 0.4.

1. False
2. True