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Question
If Δ = `|(0, "b" - "a", "c" - "a"),("a" - "b", 0, "c" - "b"),("a" - "c", "b" - "c", 0)|`, then show that ∆ is equal to zero.
Solution
Interchanging rows and columns, we get
Δ = `|(0, "a" - "b", "a" - "c"),("b" - "a", 0, "b" - "c"),("c" - "a", "c" - "b", 0)|`
Taking ‘–1’ common from R1, R2 and R3, we get
Δ = `(-1)^3|(0, "b" - "a", "c" - "a"),("a" - "b", 0, "c" - "b"),("a" - "c", "b" - "c", 0)|`
= – Δ
⇒ 2Δ = 0 or Δ = 0
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