Find sum of : $8 a b, - 5 a b, 3 a b, - a b$ .

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Solution

Find sum of : $8 a b - 5 a b, 3 a b, - a b$ .
$\Rightarrow 8 a b + (- 5 a b) + (3 a b) + (- a b)$
$= (8 - 5 + 3 - 1) a b$
$= 5 a b$

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