Technique
Row and column operations
- the i-th row and column
Adding a multiple of one row or column to another leaves the determinant unchanged, which is what makes a determinant collapsible before expansion.
71
questions use it
21
of them past-year
2017–2026
years it has appeared
35%
rated HARD
2
exams
Used alongside
How often each of these appears in the same solution as this one.
71 questions whose solution uses this
Every one was read individually — a question is here because its solution invokes this, not because the stem mentions it.
Every identity this chapter tests, with its own question set.
All Matrices & Determinants formulas