Find the determinant: ∣∣
∣∣121222314∣∣
∣∣
A
−2
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B
0
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C
3
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D
1
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Solution
The correct option is A−2 LettheerminantbeΔNow,Δ=∣∣
∣∣121222314∣∣
∣∣Δ=1∣∣∣2214∣∣∣−2∣∣∣2234∣∣∣+1∣∣∣2231∣∣∣Δ=1(8−2)−2(8−6)+1(2−6)Δ=6−4−4Δ=−2Hence,optionAiscorrectanswer.