allery70 लोकांच्या समूहात, 40 जण मासिक P वाचतात, 30 जण मासिक Q वाचतात आणि 10 जण दोन्ही मासिके वाचतात. नेमके एकच मासिक वाचणारे किती जण आहेत?
A55
B50
C40
D45
Answer & Solution
Correct answer: B. 50
नेमके एकच = (40 - 10) + (30 - 10) = 50.
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