A) {3, 7}
B) {2, 8, 9}
C) {2, 3, 7, 8, 9}
D) {3, 8, 9}
Correct Answer: B
Solution :
[b] \[A-B=\{2,9\},B-A=\{8\}\] \[\Rightarrow \,A\Delta B=(A-B)\cup (B-A)=\{2,8,9\}\]
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