যদি সেট A = {5, 15, 20, 30} এবং B = {3, 5, 15, 18, 20} হয়, তবে নিচের কোনটি A ∩ B নির্দেশ করবে?

A {3, 18, 30}

B {3, 5, 15, 18, 20, 30 }

C { 5, 15, 20}

D কোনটিই নয়

Correct Answer: Option C

A = {5, 15, 20, 30}
B = {3, 5, 15, 18, 20}

A ∩ B = {5, 15, 20, 30} ∩ {3, 5, 15, 18, 20}
= {5, 15, 20}