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Homework Statement
Prove or disprove: if A⊆B∪C, then A⊆B or A⊆C.
Homework Equations
The Attempt at a Solution
I am unsure of how to go about proving this. I know that A is a subset of B union C then A is a subset of B or A is a subset of C and I understand what a subset is and what a union is. But I just do not understand how to go about doing this proof.
Thank you.