Mathematics

Problem

If A is a

3 \times 3

matrix such that

|5 \cdot \text{adj } A| = 5

, then

|A|

is equal to : [JEE-MAIN ONLINE-2015] (1)

\pm \frac{1}{25}

(2)

\pm 5

(3)

\pm 1

(4)

\pm \frac{1}{5}