find the value of $(2 p + q) (p - p q)$ at $p$ and $q = 1$

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Solution

Given,

$(2 p + q) (p - p q)$

at, $p = q = 1$

$= [2 (1) + 1] [1 - (1) (1)]$

$= [3] [0]$

$= 0$

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