then show
that |2A| = 4 |A|.
Answer:
Multiply it by 2, we get
= 8 ? 32 = ?24.
Also |A| 
= 2 ? 8 = ?6
4 |A| = 4
× (?6) = ?24 ?. (2)
From (1) and (2), we have
|2A| = 4 |A|
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