allery100 طلباء میں، 60 جیسے ریاضی، 50 سائنس کی طرح، 40 دونوں کی طرح۔ کتنے صرف ریاضی پسند کرتے ہیں؟
A30
B20
C40
D60
Answer & Solution
Correct answer: B. 20
صرف ریاضی = کل ریاضی - دونوں = 60 - 40 = 20۔
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