alleryਇੱਕ ਹੋਸਟਲ ਵਿੱਚ, 60 ਵਿਦਿਆਰਥੀ ਰੋਜ਼ਾਨਾ A ਪੜ੍ਹਦੇ ਹਨ, 50 ਰੋਜ਼ਾਨਾ B ਪੜ੍ਹਦੇ ਹਨ, ਅਤੇ 20 ਦੋਵੇਂ ਪੜ੍ਹਦੇ ਹਨ। ਕਿੰਨੇ ਵਿਦਿਆਰਥੀ ਸਿਰਫ਼ ਰੋਜ਼ਾਨਾ A ਪੜ੍ਹਦੇ ਹਨ?
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
ਸਿਰਫ਼ ਰੋਜ਼ਾਨਾ A = n(A) - n(A ∩ B) = 60 - 20 = 40।
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