When $a = 0, b = - 1$ , find the value of the given expression.
$2 a^{2} b + 2 a b^{2} + a b$ .

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Solution

$2 a^{2} b + 2 a b^{2} + a b = 2 (0)^{2} (- 1) + 2 (0) (- 1)^{2} + (0) (- 1)$ [Putting $a = 0, b = - 1$ ]
$= 0 + 0 + 0 = 0$ .

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