Question:A = {}; B = {2, 3} হলে  `A xx B`= কোনটি? 

A {0, 2}, {0, 3} 
B {2, 3} 
C {0, 2, 3} 
D {} 

+ Answer
D 

+ Explanation
ফাকা সেটের সাথে কোনো সেটের গুণফল ফাঁকা সেটই হয়।

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