SOLUTION: https://ibb.co/Jmqk5sJ

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Question 1176874: https://ibb.co/Jmqk5sJ
Found 2 solutions by Boreal, josgarithmetic:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
It is {1,2,3,4,7}
find what B and C have in common {2,4}
then have that part of A although if anything repeats, it isn't counted twice.

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
HINT: Not the empty set.