ISRO 2016- matrices [Mech]

Question

What is the value of

a) 2 $a^2$ $b^2$ $c^2$

b) 4 $a^2$ $b^2$ $c^2$

c) 8 $a^2$ $b^2$ $c^2$

d) 0

Comments

is answer 4a²b²c²..??

Answer 1

Answer is b) 4a²b²c²

The best way to do such kind of question is that keep some values to each variable.

So, a=1, b=1, c=1

and then apply determinant you will get 4

Option b) 4a²b²c² is also giving 4 when a=1, b=1, c=1.

Hence answer is B) 4a²b²c^2.