एक कक्षा में (40) विद्यार्थी हैं, (24) ने गणित और (18) ने भौतिकी चुनी, तथा (7) ने दोनों नहीं चुनी। दोनों विषय चुनने वालों की संख्या क्या है?
In a class of (40) students, (24) chose Mathematics and (18) chose Physics, and (7) chose neither. How many chose both subjects?
Explanation opens after your attempt
A. (9)
Concept
Students choosing at least one subject are (40-7=33), so both are (24+18-33=9). Subtract neither cases first.
Why this answer is correct
The correct answer is A. (9). Students choosing at least one subject are (40-7=33), so both are (24+18-33=9). Subtract neither cases first.
Exam Tip
कम-से-कम एक विषय चुनने वाले (40-7=33) हैं, इसलिए दोनों (24+18-33=9) हैं। पहले न तो वाले घटाएं।
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