यदि (n(A)=4x+6), (n(B)=3x+9), (n\(A\cap B\)=2x+5) और (n\(A\cup B\)=80) है, तो (x) का मान ज्ञात कीजिए।
If (n(A)=4x+6), (n(B)=3x+9), (n\(A\cap B\)=2x+5), and (n\(A\cup B\)=80), find (x).
Explanation opens after your attempt
A. (14)
Concept
From ((4x+6)+(3x+9)-(2x+5)=80), (5x+10=80), so (x=14). Do not forget to subtract the intersection.
Why this answer is correct
The correct answer is A. (14). From ((4x+6)+(3x+9)-(2x+5)=80), (5x+10=80), so (x=14). Do not forget to subtract the intersection.
Exam Tip
((4x+6)+(3x+9)-(2x+5)=80) से (5x+10=80), इसलिए (x=14)। सूत्र लगाते समय छेदन घटाना न भूलें।
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