allery৫০ জন ছাত্ৰ-ছাত্ৰীৰ এটা দলত, ৩০ জনে নীলা, ২৫ জনে সেউজীয়া আৰু ১০ জনে এটাও ৰং পছন্দ নকৰে। কিমানজনে দুয়োটা ৰং পছন্দ কৰে?
A10
B15
C20
D25
Answer & Solution
Correct answer: B. 15
Union = 50 - 10 = 40। দুয়োটা পছন্দ কৰা = 30 + 25 - 40 = 15।
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