alleryএকটি কলোনিতে 70 জন হিন্দি বলেন, 50 জন ইংরেজি বলেন এবং 30 জন উভয় ভাষাতেই কথা বলেন। এই দুটি ভাষার মধ্যে অন্তত একটি ভাষায় কতজন কথা বলেন?
A60
B70
C80
D90
Answer & Solution
Correct answer: D. 90
অন্তত একটি = n(H ∪ E) = 70 + 50 - 30 = 90।
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