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Let 'A={a, b}, B={a, b, c} . ' Is 'A ⊂ ...

Let 'A={a, b}, B={a, b, c} .
' Is 'A ⊂ B ?' What is 'A ∪ B ?'.

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Yes, .A sub B..
.A uu B=a, b, c.
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