If \( A \) and \( B \) are finite sets and \( A \subset B \), then

• A

  \( n(A \cup B)=n(A) \)
• B

  \( n(A \cap B)=n(B) \)
• Correct answer
  C

  \( n(A \cup B)=n(B) \)
• D

  \( n(A \cap B)=\varnothing \)

Solution

Given that, \( A \) is the subset of \( B \), that is,

Therefore, \( n(A \cup B)=m(B) \)

Hence, the correct answer is option: 'C'.