Add
$3 a b, 14 a b, - 4 a b$

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Solution

The given pairs of terms $3 a b, 14 a b a n d - 4 a b$ are like terms.
So, adding the numerical coefficient of each term.
The sum
$= 3 a b + 14 a b + (- 4 a b) = 17 a b + (- 4 a b) = 17 a b - 4 a b = 13 a b$

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