allery45 طلباء کی کلاس میں 25 تاریخ، 20 جغرافیہ پڑھتے ہیں اور 5 ان دونوں میں سے کوئی مضمون نہیں پڑھتے۔ دونوں مضامین پڑھنے والے کتنے ہیں؟
A15
B10
C5
D0
Answer & Solution
Correct answer: C. 5
یونین = 45 - 5 = 40۔ دونوں = 25 + 20 - 40 = 5۔
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