# Probability of an Event "A" Not to Happen

## Trending Questions

**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.

0.2

0.8

0.6

0.4

**Q.**

A bag contains 12 balls of which 'x' are white.

(i) If one ball is drawn at random, what is the probability that it will be a white ball?

(ii) If 6 more white balls are put in the bag, the probability of drawing a white ball will be double than that in case (i), Find x. [4 MARKS]

**Q.**A bag contains white, black and red balls only.A ball is drawn at random from the bag.If the probability of getting a white ball is 310 and that of a black ball is 25, then find thew probability of getting a red ball.if the ball bag contains 20 black balls, then find the total number of balls in the bag.

**Q.**

Six cards are drawn simultaneously from a pack of playing cards. What is the probability that $3$ will be red and $3$ black

${}^{26}C_{6}$

$\frac{{}^{26}C_{3}}{{}^{52}C_{6}}$

$\frac{{}^{26}C_{3}\xc2\xb7{}^{26}C_{3}}{{}^{52}C_{6}}$

$\frac{1}{2}$

**Q.**

A bag contains $4$white, $5$black, and $6$red balls. If a ball is drawn at random, then what is the probability that the drawn ball is either white or red

$\frac{4}{15}$

$\frac{1}{2}$

$\frac{2}{5}$

$\frac{2}{3}$

**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 23. Find the probability of drawing a blue marble from the jar.

12

14

23

13

**Q.**

Out of 100 balls in a bag 30 are green, 35 are blue and 35 are red. Find the probability that a ball drawn from the bag is (i) green (ii) blue (iii) red.

**Q.**

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

16

14

56

34

**Q.**A bag contains 7 white, 6 red and 2 black balls. One ball is taken out at random. Find the probability that the ball drawn is:

i) white

ii) neither red nor white

iii) either white or red or black

iv) not black

[4 MARKS]

**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?

3√3π

32π

3√32π

3√32

**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

13

14

49

79

**Q.**

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

1415

1418

1215

115

**Q.**

A bag contains 12 balls of which 'x' are white.

(i) If one ball is drawn at random, what is the probability that it will be a white ball?

(ii) If 6 more white balls are put in the bag, the probability of drawing a white ball will be double than that in case (i), Find x. [4 MARKS]

**Q.**What is the probability of picking a red numbered card with number more than 6?

- 413
- 213
- 513
- 613

**Q.**

A bag contains 4 red and 8 blue marbles. A marble is drawn at random. The probability of drawing red is

16

13

23

18

**Q.**How do you write the probability value of 0.05 in percentage format?

- 5%
- 50%
- 25%
- None of the above

**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?

14

13.

712

1

**Q.**The probability of getting a perfect square number in a single throw of a dice is ____.

1/2

1/3

2/3

3/4

**Q.**

**Question 26**

A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house, B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is

(a) 423

(b) 623

(c) 823

(d) 1723

**Q.**

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

0.50

0.75

0.25

0

**Q.**

An equilateral triangle is drawn with its vertices if we put a dot in it without looking into the picture, find the probability of the dot being outside the triangle?

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

- 0.79
- 0.25
- 0.50
- 0.36

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

- False
- True

**Q.**Tickets numbered 2, 3, 4, 5, ....., 100, 101 are placed in a box and mixed thoroughly. One ticket is drawn at random from the box. Find the probability that the number on the ticket is a number which is a perfect square.

**Q.**The probability of getting a perfect square number in a single throw of a dice is ____.

1/2

1/3

2/3

3/4

**Q.**

In a cricket match, a batsman hit a boundary 6 times (out of 30 balls). Find the probability that next ball he plays is not a boundary.

0.2

0.4

0.6

0.8