a 1 2 b a c b 3 d annb কত, সেট ও ফাংশন, গণিত

Question:A = {1, 2}, B = {a, 2}, C = {b, 3}, D = {a, b}
`AnnB` = কত?

A {1} 
B {1, 2} 
C {a, 2} 
D {2}

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Question:A = {1, 2}, B = {a, 2}, C = {b, 3}, D = {a, b} `AnnB` = কত?