Topics

General Knowledge
General Science
General English
Aptitude
General Computer Science
General Intellingence and Reasoning
Current Affairs
Exams
Elementary Mathematics
English Literature

If two balls are selected at random what is the probability that one ball is white and the other ball is red ?

A) \( \Large \frac{91}{190} \)
B) \( \Large \frac{63}{190} \)
C) \( \Large \frac{5}{19} \)
D) \( \Large \frac{4}{95} \)

Correct Answer:


B) \( \Large \frac{63}{190} \)

Description for Correct answer:
Total possible outcomes = 190

Favourable outcomes = Selection of 1 ball out of 9 red balls and 1 ball from 7 white balls

= \( \Large ^{9}C_{1} \times ^{7}C_{1} = 9 \times 7 \) = 63

Therefore, Required probability = \( \Large \frac{63}{190} \)

Part of solved Probability questions and answers : >> Aptitude >> Probability

Comments

Similar Questions

1). A bag contains 3 red balls, 5 yellow balls and 7 pink balls. If one ball is drawn at random from the bag, what is the probability that it is either pink or red?

A). \( \Large \frac{1}{3} \)

B). \( \Large \frac{2}{3} \)

C). \( \Large \frac{1}{4} \)

D). \( \Large \frac{2}{5} \)

2). A bag contains 5 red balls, 7 yellow balls and 3 pink balls. If two balls are drawn at random from the bag, one after another, what is the probability that the first ball is red and the second ball is yellow?

A). \( \Large \frac{5}{12} \)

B). \( \Large \frac{3}{8} \)

C). \( \Large \frac{1}{4} \)

D). \( \Large \frac{1}{6} \)

3). There are 6 red balls, 5 yellow and 3 pink balls in an urn. Two balls are drawn at random. What is the probability that none of the drawn balls is of red colour?

A). \( \Large \frac{8}{13} \)

B). \( \Large \frac{7}{13} \)

C). \( \Large \frac{6}{13} \)

D). \( \Large \frac{4}{13} \)

4). A bag contains 4 red, 5 yellow and 6 pink balls. Two balls are drawn at random. What is the probability that none of the balls drawn are yellow in colour?

A). \( \Large \frac{1}{7} \)

B). \( \Large \frac{3}{7} \)

C). \( \Large \frac{2}{7} \)

D). \( \Large \frac{5}{14} \)

5). 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?

A). \( \Large \frac{3}{4} \)

B). \( \Large \frac{4}{7} \)

C). \( \Large \frac{1}{8} \)

D). \( \Large \frac{3}{7} \)

6). What is the probability that a number selected from numbers 1, 2. 3, ....... 30, is prime number, when each of the given numbers is equally likely to be selected?

A). \( \Large \frac{9}{30} \)

B). \( \Large \frac{8}{30} \)

C). \( \Large \frac{10}{30} \)

D). \( \Large \frac{11}{30} \)

7). An urn contains 9 red, 7 white and 4 black balls. If two balls are drawn at random, find the probability that both the balls are red.

A). \( \Large \frac{17}{95} \)

B). \( \Large \frac{18}{95} \)

C). \( \Large \frac{1}{12} \)

D). \( \Large \frac{91}{190} \)

8). Out of 5 girls and 3 boys, 4 children are to be randomly selected for a quiz contest. What is the probability that all are girls?

A). \( \Large \frac{1}{14} \)

B). \( \Large \frac{1}{7} \)

C). \( \Large \frac{5}{17} \)

D). \( \Large \frac{2}{17} \)

9). If three marbles are picked at random, what is the probability that either all are green or all are red?

A). \( \Large \frac{7}{44} \)

B). \( \Large \frac{7}{12} \)

C). \( \Large \frac{5}{12} \)

D). \( \Large \frac{1}{44} \)

10). If two marbles are picked at random, what Is the probability that both are red?

A). \( \Large \frac{3}{7} \)

B). \( \Large \frac{1}{2} \)

C). \( \Large \frac{2}{11} \)

D). None of these