allery100 জন শিক্ষার্থীর মধ্যে, 60 জন গণিত পছন্দ করে, 50 জন বিজ্ঞান পছন্দ করে এবং 40 জন উভয় বিষয়ই পছন্দ করে। কতজন শুধুমাত্র গণিত পছন্দ করে?
A30
B20
C40
D60
Answer & Solution
Correct answer: B. 20
শুধুমাত্র গণিত = মোট গণিত - উভয় = 60 - 40 = 20।
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