Symmetric Difference of Sets

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Q. Let $A=\{1,2,3,4\},$ $B=\{2,3,4,5,6\},$ then $A\Delta B$ is

1. $\{2,3,4\}$
2. $\left\{1\right\}$
3. $\{5,6\}$
4. $\{1,5,6\}$

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Q. Let $A=\{a,b,c,d,e\}$ and $B=\{a,c,g,f\}.$ Find $A-B$ and $B-A.$

1. $\{b,d,e\}$; $\{g,f\}$
2. $\{b,d\}$; $\left\{f\right\}$
3. $\left\{\varphi \right\}$; $\{g,f\}$
4. $\{a,b,c,d,e\}$; $\{g,f\}$

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