allery60 জন ছাত্ৰ-ছাত্ৰী থকা এটা শ্ৰেণীত, 35 জনে গণিত ভাল পায়, 30 জনে বিজ্ঞান ভাল পায় আৰু 15 জনে দুয়োটা ভাল পায়। কিমানজনে কেৱল গণিত ভাল পায়?
A15
B20
C25
D30
Answer & Solution
Correct answer: B. 20
Only Math = n(Math) - n(Math ∩ Science) = 35 - 15 = 20।
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