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Questions  >>  Olympiad-Math  >>  Class 8
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Q)

Factorize : $r^2 -10 r +21$ is

$\begin{array}{1 1} (r-1)(r-4) \\ (r-7)(r-3) \\ (r-7)(r+3) \\ (r+7)(r+3) \end{array} $

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