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Question
Evaluate `|(1,x,y),(1,x+y,y),(1,x,x+y)|`
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Solution
Let, Δ = `|(1,x,y),(1,x+y,y),(1,x,x+y)|`
Applying R2 → R2 − R1 and R3 → R3 − R1, we get
= `|(1,x,y), (0,y,0), (0, 0,x)|`
= 1 × y × x
= xy
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