alleryএখন কলনীত, 70 জনে হিন্দী কয়, 50 জনে ইংৰাজী কয় আৰু 30 জনে দুয়োটা কয়। কিমানজনে এই দুটা ভাষাৰ অন্ততঃ এটা কয়?
A60
B70
C80
D90
Answer & Solution
Correct answer: D. 90
At least one = n(H ∪ E) = 70 + 50 - 30 = 90।
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