Question: Please help me to solve Question 7 and 8 with explanation element r is in the set on one side of the equality, then it

Please help me to solve Question 7 and 8 with explanation

element r is in the set on one side of the equality, then it must also be in the set on the other side of the equality. 7. Show that if Si C S2, then Sa C S1. 8. Show that Si = S, if and only if S US, = SinS

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