allery100 छात्रों में से, 60 गणित पसंद करते हैं, 50 विज्ञान पसंद करते हैं और 40 दोनों पसंद करते हैं। केवल गणित पसंद करने वाले छात्रों की संख्या कितनी है?
A30
B20
C40
D60
Answer & Solution
Correct answer: B. 20
केवल गणित = कुल गणित - दोनों = 60 - 40 = 20.
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