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

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

Sets

Solution:

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