JEE Main 2015MathematicsSets and RelationsEasyMCQ

JEE Main 2015Sets and Relations Question with Solution

JEE Main 2015 (10 Apr Online)

Question

In a certain town, 25% of the families own a phone and 15% own a car; 65% families own neither a phone nor a car and 2000 families own both a car and a phone. Consider the following three statements:

i 5% families own both a car and a phone.

ii 35% families own either a car or a phone.

iii 40000 families live in the town.

Then,

Choose an option

Show full solutionCorrect option: C
Correct answer
CAll i, ii and iii are correct

Step-by-step explanation

Let set A contains families which own a phone and set B contain families which own a car.

If 65% families own neither a phone nor a car, then 35% will own either a phone or a car

nAB=35%

Also we know that

nAB=nA+nB-n(AB)

35=25+15-n(AB)

nAB=5%

5% families own both phone and car and it is given to be 2000 .
5%  of x=2000

5x100 =2000

x=40000

Hence, i, ii and iii are correct.

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About this question

This is a previous-year question from JEE Main 2015, covering the Sets and Relations chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.