allery50 জন শিক্ষার্থীর একটি দলে, 30 জন নীল পছন্দ করে, 25 জন সবুজ পছন্দ করে এবং 10 জন কোনোটিই পছন্দ করে না। কতজন উভয় রঙই পছন্দ করে?
A10
B15
C20
D25
Answer & Solution
Correct answer: B. 15
Union = 50 - 10 = 40। উভয় পছন্দ করে = 30 + 25 - 40 = 15।
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