(1)/(4)

If A=[(1,-3,-4),(-1,3,4),(1,-3,-4)] then A^(2)=

The matrix [(1,-3,-4),(-1,3,4),(1,-3,-4)] is

In the following list of numerals, how many 2's are followed by 1's but not preceded by 4 ? 4 2 1 2 1 4 2 1 1 2 4 4 4 1 2 2 1 2 1 2 1 4 4 2 1 4 2 1 2 1 2 4 1 4 2 1 2 4 1 4 6 1) 2 2) 3 3) 4 4) 5 5) None of these