एक विद्यालय में (120) विद्यार्थियों में (68) ने (A), (57) ने (B), और (31) ने दोनों चुने। कम से कम एक चुनने वालों का प्रतिशत कितना है?
In a school of (120) students, (68) chose (A), (57) chose (B), and (31) chose both. What is the percentage choosing at least one?
Explanation opens after your attempt
A. (78.33%)
Concept
At least one is (68+57-31=94), so the percentage is \(\frac{94}{120}\times100=78.33%\). Find the count first, then convert to percentage.
Why this answer is correct
The correct answer is A. (78.33%). At least one is (68+57-31=94), so the percentage is \(\frac{94}{120}\times100=78.33%\). Find the count first, then convert to percentage.
Exam Tip
कम से कम एक (=68+57-31=94), इसलिए प्रतिशत \(\frac{94}{120}\times100=78.33%\) है। पहले संख्या निकालें फिर प्रतिशत लें।
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