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Questions  >>  Olympiad-Math  >>  Class 7
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Multiply $(a+b)$ and $(2a-3b+c)$

$\begin{array}{1 1} 2a^2-ab+ac+bc-3b^2 \\ 2a^2+ab+ac+bc-3b^2 \\ 2a^2+ab+ac+bc+3b^2 \\ 2a^2 +ab-ac+bc-3b^2 \end{array} $

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