Determinants

Consider the system of linear equations x+y+z=4 , x+2y+2 z=10 , x+3y+4 2z= 2+15 where , . Which one of the following statements is NOT correct ?

1. The system has unique solution if 12 and 1, 15
2. The system has infinite number of solutions if = 12 and =15
3. The system is consistent if 12
4. The system is inconsistent if = 12 and 1

Let R= pmatrixx&0&0\\0&y&0\\0&0&z pmatrix be a non-zero 3 3 matrix, where x =y ( + 2 3 )=z ( + 4 3 ) 0, (0,2 ). For a square matrix M, let trace (M) denote the sum of all the diagonal entries of M. Then, among the statements: (I) Trace (R)=0 (II) If trace (adj(adj(R)))=0, then R has exactly one non-zero entry.

1. Only (I) is true
2. Only (II) is true
3. Both (I) and (II) are true
4. Neither (I) nor (II) is true

Consider the system of linear equations x+y+z=5, x+2y+ 2 z=9, x+3y+ z= , where , R. Then, which of the following statements is NOT correct?

1. System is consistent if 1 and =13
2. System is inconsistent if =1 and 13
3. System has unique solution if 1 and 13
4. System has infinite number of solutions if =1 and =13

Let A= bmatrix1&0&0\\0& & \\0& & bmatrix and |2A|3=221 where , Z. Then a value of is

1. 9
2. 17
3. 3
4. 5

Let A= bmatrix2&1&2\\6&2&11\\3&3&2 bmatrix and P= bmatrix1&2&0\\5&0&2\\7&1&5 bmatrix. The sum of the prime factors of |P-1AP-2I | is equal to

1. 66
2. 27
3. 23
4. 26

Let for any three distinct consecutive terms a, b, c of an A.P, the lines ax+by+c=0 be concurrent at the point P and Q( , ) be a point such that the system of equations x+y+z=6, 2x+5y+ z= and x+2y+3z=4, has infinitely many solutions. Then (PQ)2 is equal to .

Let A= bmatrix2&0&1\\1&1&0\\1&0&1 bmatrix, B= [B1, B2, B3 ], where B1, B2, B3 are column matrices, and AB1= bmatrix1\\0\\0 bmatrix, AB2= bmatrix2\\3\\0 bmatrix, AB3= bmatrix3\\2\\1 bmatrix If =|B| and is the sum of all the diagonal elements of B, then 3+ 3 is equal to .

The values of , for which vmatrix1 & 32 & + 32\ 1 & 13 & + 13\ 2 +3 & 3 +1 & 0 vmatrix=0, lie in the interval

1. (-2,1)
2. (- 32, 32 )
3. (-3,0)
4. (0,3)