Question

See the attachment above ​

Answer 1

Answer:

A={2,3,4,5,6,7,etc}

B={3,2,1}

symmetric difference of A & B is=(A-B) union (B-A)

Step-by-step explanation:

A-B ={4,5,6,7etc}

B-A={1}

(A-B) union (B-A)={1,4,5,6,7etc}

A-B means, The numbers which are present only in A and not in B. like that,B-A means the numbers which are present only in B and not in A.

union means all numbers present