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Question

The value of the determinant xax+ayby+bzcz+c∣ ∣ ∣ is

A
0
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B
ax+by+cz
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C
x2+y2+z2
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D
a2+b2+c2
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Solution

The correct option is A 0

xax+ayby+bzcz+c∣ ∣ ∣ The upper matrix can be expressed as the sum of two determinants asxaaybbzcc∣ ∣ ∣+xaxybyzcz∣ ∣ ∣ Since, two columns are same in both the matrices,xaaybbzcc∣ ∣ ∣ = 0 and xaxybyzcz∣ ∣ ∣ =0Hence, their sum is 0

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