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### Question 1

45 defective pens are accidentally mixed with 40 good ones. It is not possible to just look at a pen and tell whether it is defective or not. One pen is taken out at random. What is the probability that it is a defective pen?

### Question 2

Karmjeet and Sham are friends. What is the probability that both will have different birthdays, ignoring a leap year?

### Question 3

Two fair dice are tossed simultaneously. What is the probability of getting two numbers whose product is odd?

### Question 4

What is the probability of getting a sum of 7 from two throws of a dice?

### Question 5

A box contains 2 navy, 4 red and 6 sky blue marbles. What is the probability of drawing a marble that is not sky blue if 2 marbles are drawn out randomly?

**A**

${5/22}$.

**B**

$6/12$.

**C**

$6/66$.

**D**

$10/66$.

**Soln.**

**Ans: a**

Total number of marbles is 12. Combinations of 2 marbles that are possible = ^{12}C_{2} = ${12 × 11}/2$ = 66. Chances of drawing a non-sky blue ball are ^{6}C_{2} = $(6 × (6 - 1))/2$ = 15. So probability = 15/66 = ${5/22}$.

This Blog Post/Article "Probability Quiz Set 001" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2017-04-07.