What will be remainder when 17200 is divided by 18 ?
When $ n $ is even. $\left( x^ n - a ^n\right)$ is completely divisibly by ( x + a )
(17200 - 1200) is completely divisible by (17 + 1), i.e., 18.
$\Rightarrow$ (17200 - 1) is completely divisible by 18.
$\Rightarrow$ On dividing 17200 by 18, we get 1 as remainder.
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