Answer :

Let us assume U be the set of all students in the group

Let E be the set of students who know English

And, let H be the set of the students who know Hindi

∴

Given that, number of students who know Hindi n (H) = 100

Number of students who knew English, n (E) = 50

Number of students who know both,

We have to find the total number of students in the group i.e. n (U)

∴

= 100 + 50 – 25

= 125

∴ Total number of students in the group = 125 students

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