=&ex} Q-4: [5+5 marks] a + c a) Let S = be R. Find three vectors in R3 so that each vector in S b - al can be written as a linear combination of the three vectors. Are these vectors linearly independent? Justify your answer. 1 2 -2 1 1 1 1 0 b) Let A = Determine whether the rows of A are linearly 2 4 -5 4 -2 -4 4 -1 independent. Evaluate | - 2A2 and 13A-1)