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Question

If a,b and c are non-zero real numbers then D=∣∣ ∣ ∣∣b2c2bcb+cc2a2cac+aa2b2aba+b∣∣ ∣ ∣∣

A
abc
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B
a2b2c2
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C
bc+ca+ab
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D
Zero
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Solution

The correct option is D Zero
D=∣ ∣ ∣b2c2bcb+cc2a2acc+aa2b2aba+b∣ ∣ ∣
=∣ ∣ ∣b2c2bcba2c2acca2b2aba∣ ∣ ∣+∣ ∣ ∣b2c2bccc2a2caaa2b2abb∣ ∣ ∣
=bca∣ ∣ ∣b2c2c1a2c2a1a2b2b1∣ ∣ ∣+bac∣ ∣ ∣b2c2b1a2c2c1a2b2a1∣ ∣ ∣
=abc[bc2(ab)c(a2cab2)+1(a2cba2b2)]+abc[b2c(ca)b(ac2a2b)+1(a2c2a2bc)]
=abc[bac2b2c2a2c2+ab2c+a2cba2b2+b2c2ab2cbac2+a2b2+a2c2a2bc]
=0
D=0

1092947_690148_ans_18f7146d281f4206b7a138532fff65fe.png

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