Question

If $B=\{x:x$ is a student presently studying in both classes $X$ and $XI\}$. Then, the number of elements in set $B$ are

• A. finite
• B. infinite
• C. zero
• D. None of these

Answer 1

Answer: (C)

A student cannot study simultaneously in both classes $X$ and $XI$. Thus, the set $B$ contains no element at all.