একটি শ্রেণির 100 জন শিক্ষার্থীর মধ্যে 50 জন গণিত এবং 45 জন পদার্থবিজ্ঞান পছন্দ করে। যদি 20 জন শিক্ষার্থী গণিত ও পদার্থবিজ্ঞান উভয় বিষয়ই পছন্দ করে, তবে কতজন শিক্ষার্থী এই দুটি বিষয়ের কোনটিই পছন্দ করে না?
A. 15 জন
B. 20 জন
C. 25 জন
D. 30 জন
সঠিক উত্তরঃ
C.
25 জন
Explanation: \(n(M \cup P) = 50 + 45 - 20 = 75\)। পছন্দ করে না = \(100 - 75 = 25\)।
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