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যদি সেট A = {5,15,20,30} এবং B = {3,5,15,18,20} হয় তবে নীচের কোনটি A ∩ B নির্দেশ করবে ?
A
{3, 18, 30}
B
{3, 5, 15, 18, 20, 30}
C
{5, 15, 20}
D
কোনটিই নয়
Answer: C - {5, 15, 20}
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