If A is a square matrix of order 3 and det(A) =1. If B =2A is another matrix, the value of det(B) is :

2 4 6 8

8

order (A) = 3, $|A|=1$ $B=2A$ so $|B|=|2A|$ $|B|=2^3|A|=2^3×1$ $|B|=8$