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</math>
Unlike for [[multiplication and repeated addition|repeated addition]], this does not commute:
:<math>\frac ab \neq \frac ba \quad \text{implies}\quad
\underbrace{a \parallel a \parallel \cdots \parallel a}_{b\text{ times}} \,\neq\, \underbrace{b \parallel b \parallel \cdots \parallel b}_{a\text{ times}}~\!.</math>
=== Binomial expansion ===
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