allery100 طلباء کے گروپ میں 60 کرکٹ، 50 فٹ بال اور 20 دونوں کھیلتے ہیں۔ کتنے طلباء نہ کرکٹ کھیلتے ہیں نہ فٹ بال؟
A10
B20
C30
D40
Answer & Solution
Correct answer: A. 10
اتحاد = n(C) + n(F) - n(C ∩ F) = 60 + 50 - 20 = 90۔ دونوں میں سے کوئی کھیل نہ کھیلنے والے = 100 - 90 = 10۔
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