Question

3128aarya pehle app intro do me app ko 100 points dunga mean 2 question me 50 x 2​

Answer 1

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Class 11

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>>In a group of students, 100 students kno

Question

In a group of students, 100 students know Hindi,50 know English and 25 know both. Each of the students knows either Hindi or English. How many students are there in the group?

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Solution

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Let U be the set of all students in the group.

Let E be the set of all students who know English.

Let H be the set of all students who know Hindi.

∴H∪E=U

Given n(H)=100 and n(E)=50

n(H∩E)=25

n(U)=n(H)+n(E)−n(H∩E)

=100+50−25

Hence, there are 125 students in the group.