Question 1

Mathematics Sets Medium

The set \( (A\triangle B)\cap C \) is not equal to

(A) \( (A\cap C)\Delta(B\cap C) \)
(B) \( ((A\cap B^{c})\cap C)\cup((B\cap A^{c})\cap C) \)
(C) (A△B)∩C)
(D) \( (A\cap B\cap C)^{c}\cap((A\cup B)\cap C) \)
View Dynamic Solution & Explanation
Correct Solution: Option C

Step-by-step Solution:

By definition, the symmetric difference is \( A \Delta B = (A \setminus B) \cup (B \setminus A) \). When we intersect with \( C \), we get \( (A \Delta B) \cap C = ((A \setminus B) \cap C) \cup ((B \setminus A) \cap C) \), which matches option B. Option A expands to the same set since intersection distributes over symmetric difference. Option D is \( ((A \cup B) \setminus (A \cap B)) \cap C \), which is also another form of the symmetric difference intersected with \( C \). Option C evaluates to \( C \setminus (A \cap B) \), which is not necessarily equal to \( (A \Delta B) \cap C \). Thus, option C is the correct answer.