alleryਇੱਕ ਕਲੋਨੀ ਵਿੱਚ, 70 ਹਿੰਦੀ ਬੋਲਦੇ ਹਨ, 50 ਅੰਗਰੇਜ਼ੀ ਬੋਲਦੇ ਹਨ, ਅਤੇ 30 ਦੋਵੇਂ ਬੋਲਦੇ ਹਨ। ਕਿੰਨੇ ਲੋਕ ਇਨ੍ਹਾਂ ਦੋਵਾਂ ਵਿੱਚੋਂ ਘੱਟੋ-ਘੱਟ ਇੱਕ ਭਾਸ਼ਾ ਬੋਲਦੇ ਹਨ?
A60
B70
C80
D90
Answer & Solution
Correct answer: D. 90
ਘੱਟੋ-ਘੱਟ ਇੱਕ = n(H ∪ E) = 70 + 50 - 30 = 90।
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