Probability of an Event "A" to Happen

Q. A lot of 24 bulbs contains 25% defective bulbs. A bulb is drawn at random from the lot. It is found to be not defective and it is not put back. Now, one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

1. $\frac{18}{23}$
2. $\frac{20}{23}$
3. $\frac{15}{24}$
4. $\frac{17}{23}$

Q.

Two dice are thrown simultaneously. Find the probability of getting two numbers such that their product is 4.

1. 1/6

2. 1/12

3. 3/4

4. 1/2

Q.

A coin is tossed twice. What is the probability that at least one tail occurs?

1. 1/4

2. 5/6

3. 1/2

4. 3/4

Q.

Out of 50 students in a class taking a test, 35 of them passed whereas the other 15 failed. What is the probability that a student selected at random passed the test?

1. 0.15
2. 0.3
3. 0.35
4. 0.7

Q.

You are given a dart board of radius R cm. What is the probability that you hit the bull's eye of radius r cm?

1. $\frac{r}{R}$

2. Insufficient data

3. $\frac{r^2}{R^2}$

4. $\frac{R}{r}$

Q.

One is asked to select a two -digit number. What is the probability of getting the first digit greater than the second digit ?

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

2. $\frac{1}{5}$

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

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

Q.

There are 50 mangoes in a basket, 20 of which are unripe. Another basket contains 40 mangoes, with 15 unripe. If we take one mango from each basket, what is the probability of both being ripe?

1. 0

2. $\frac{1}{8}$

3. $\frac{3}{8}$

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

Q.

A man speaks truth 3/4 times. What is the probability of him lying?

1. 1/2

2. 1/3

3. 1/4

4. 1

Q.

If a dice is rolled once, what is the probability of getting an even number on the upper face?

1. 0.5

2. 0.7

3. 1

4. 0.3

Q.

What is the probability that a leap year selected at random, contains 53 Sundays?

1. 2/7

2. 3/7

3. 1/7

4. 4/7