If \( C = \begin{pmatrix} 1 & 1 & 1 \\ 1 & 2 & 3 \\ 1 & 3 &a

Practice Questions

Q1
If \( C = \begin{pmatrix} 1 & 1 & 1 \\ 1 & 2 & 3 \\ 1 & 3 & 6 \end{pmatrix} \), find \( \det(C) \).
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  2. 1
  3. 2
  4. 3

Questions & Step-by-Step Solutions

If \( C = \begin{pmatrix} 1 & 1 & 1 \\ 1 & 2 & 3 \\ 1 & 3 & 6 \end{pmatrix} \), find \( \det(C) \).
  • Step 1: Identify the matrix C, which is given as C = [[1, 1, 1], [1, 2, 3], [1, 3, 6]].
  • Step 2: Understand that the determinant of a matrix can be zero if one column is a linear combination of the others.
  • Step 3: Look at the first column of the matrix, which is [1, 1, 1].
  • Step 4: Check if the first column can be formed by adding or scaling the other columns.
  • Step 5: Notice that the first column can be expressed as a combination of the second and third columns: 1 * (second column) - 1 * (third column) = [1, 1, 1].
  • Step 6: Since the first column is a linear combination of the other columns, the determinant of the matrix C is 0.
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