Evaluate \( \begin{vmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0

Practice Questions

Q1
Evaluate \( \begin{vmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{vmatrix} \)
  1. 0
  2. 1
  3. 2
  4. 3

Questions & Step-by-Step Solutions

Evaluate \( \begin{vmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{vmatrix} \)
Correct Answer: 1
  • Step 1: Identify the matrix given in the question. It is a 3x3 matrix: \( \begin{pmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{pmatrix} \).
  • Step 2: Recognize that this matrix is called the identity matrix, which has 1s on the diagonal and 0s elsewhere.
  • Step 3: Recall the property of the determinant of the identity matrix. The determinant of any identity matrix is always 1.
  • Step 4: Therefore, conclude that the determinant of the given matrix is 1.
  • Determinants – Understanding how to calculate the determinant of a matrix, particularly the identity matrix.
  • Identity Matrix – Recognizing that the determinant of an identity matrix is always 1.
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