allery60 طلباء کی کلاس میں، 35 جیسے ریاضی، 30 جیسے سائنس، اور 15 دونوں کی طرح۔ صرف ریاضی کو کتنے لوگ پسند کرتے ہیں؟
A15
B20
C25
D30
Answer & Solution
Correct answer: B. 20
صرف ریاضی = n(ریاضی) - n(ریاضی ∩ سائنس) = 35 - 15 = 20۔
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