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Assertion (A): Given, length \(a\) \(=\) \(13\) \(cm\) and breadth \(=\) \(11\) \(cm\) of a reactangle. If, its length is decreased by \(m\) \(=\) \(2\) \(cm\) and breadth is increased by \(n\) \(=\) \(6\) \(cm\), then their difference in area is calculated using \(-mb + an - mn\).
Reason (R): Area of the rectangle \(=\) \(\text{length} + \text{breadth}\)
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