allery50 विद्यार्थियों की एक कक्षा में, 30 गणित पढ़ते हैं, 25 विज्ञान पढ़ते हैं और 15 दोनों विषय पढ़ते हैं। इनमें से कोई भी विषय न पढ़ने वाले विद्यार्थियों की संख्या कितनी है?
A5
B12
C10
D8
Answer & Solution
Correct answer: C. 10
सम्मिलन (यूनियन) = 30 + 25 - 15 = 40 विद्यार्थी, अतः कोई भी विषय न पढ़ने वाले = 50 - 40 = 10.
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