GATE Mechanical Engineering (ME) 2018 Shift 1 Solved Paper

$\log |\mathit{a}|+\log |\mathit{b}|+\log |\mathit{c}|=0$
It is possible only,
If $\left|\mathit{a}\right|,|\mathit{b}|$ and $\left|\mathit{c}\right|$ all are equal to 1 .
So, a, b, c may be respectively '+1' or '-1'.
For minimum value all three will be negative.
So, minimum value $=-3$
For maximum value all three will be positive.
So, maximum value $=+3$.