256 . If determinant of a matrix A is Zero than :

  • A. A is a Singular matrix
  • B. A is a non - Singular Matrix
  • C. First and last rows of the matrix must be same
  • D. First and last columns of the matrix must be same
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259 . If for a square matrix A , A2=A then such a matrix is known as :

  • A. Idempotent matrix
  • B. Orthagonal matrix
  • C. Null matrix
  • D. Identity matrix
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265 . If number a is 22×31×50andbis21×31×51then1cmofa,bis:

  • A. 2 2 × 3 1 × 5 1
  • B. 2 2 × 3 2 × 5 2
  • C. 2 3 × 3 1 × 5 0
  • D. 2 2 × 3 2 × 5 0
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266 . If p = 3/5, q = 7/9 and r = 5/7, then

  • A. p < q < r
  • B. q < r < p
  • C. p < r < q
  • D. None of these
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