allery45 छात्रों की एक कक्षा में, 25 इतिहास पढ़ते हैं, 20 भूगोल पढ़ते हैं और 5 इनमें से कोई भी विषय नहीं पढ़ते हैं। कितने छात्र दोनों विषय पढ़ते हैं?
A15
B10
C5
D0
Answer & Solution
Correct answer: C. 5
सम्मिलन (Union) = 45 - 5 = 40. दोनों विषय पढ़ने वाले = 25 + 20 - 40 = 5.
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