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### Question 1

A bag contains 2 Red, 8 Blue and 4 Green marbles. What is the probability of drawing a Red marble if 2 marbles are drawn out randomly?

**A**

${25/91}$.

**B**

$4/14$.

**C**

$26/91$.

**D**

$30/91$.

**Soln.**

**Ans: a**

Total number of marbles is 14. Combinations of 2 marbles that are possible = ^{14}C_{2} = ${14 × 13}/2$ = 91. If one of the two balls is red, then red + red is one possibility, and 2 × (8 + 4) are the other possibilities. So total favorable outcomes = 1 + 2 × 12 = 25, and the probability is 25/91 = ${25/91}$.

### Question 2

From a deck of 52 cards 1 card is drawn at random. What is the probability that it will be a red "5"?

### Question 3

A box contains 20 red balls and an unknown number of blue balls. If the probability of drawing a blue ball is 5 times the probability of drawing a red ball, then how many blue balls are there in the box?

### Question 4

Three unbiased coins are tossed. What is the probability of getting at most two tails?

### Question 5

A piggy bank contains 73 nos. of 50-paise coins, 37 nos. of 1-rupee coins and 81 nos. of 2-rupee coins. The piggy bank is turned upside down, and one coin falls down. What is the probability that it is a 50-paise coin?

This Blog Post/Article "Probability Quiz Set 005" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2017-05-17.