allery70 افراد کے گروپ میں 40 چائے، 35 کافی پیتے ہیں اور 15 نہ چائے پیتے ہیں نہ کافی۔ دونوں پینے والے کتنے ہیں؟
A10
B15
C20
D25
Answer & Solution
Correct answer: C. 20
یونین = 70 - 15 = 55۔ دونوں پیو = 40 + 35 - 55 = 20۔
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