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Can anyone help me solve this problem? For any finite set (= a set containing a finite number of elements) X; let us denote by

Can anyone help me solve this problem?

For any finite set (= a set containing a finite number of elements) X; let us denote by |X| the

number of elements in X: Let A1; A2 and A3 be any finite sets. Show that

| A1 U A2 U A3 | = | A1 | + | A2 | + | A3 | - | A1 A2 | - | A1 A3 | - | A2 A3 | + | A1 A2 A3 |.

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