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Question

The value of ∣ ∣ ∣a2+1abacabb2+1bcacbcc2+1∣ ∣ ∣ is:

A
1+a+b+c
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B
1+a3+b3+c3
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C
abc
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D
1+a2+b2+c2
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Solution

The correct option is D 1+a2+b2+c2
Δ=∣ ∣ ∣a2+1abacabb2+1bcacbcc2+1∣ ∣ ∣
Multiplying C1,C2,C3 by a,b,c respectively

Δ=1abc∣ ∣ ∣a(a2+1)ab2ac2a2bb(b2+1)bc2a2cb2cc(c2+1)∣ ∣ ∣
Taking common a,b,c from R1,R2,R3 respectively

Δ=abcabc∣ ∣ ∣a2+1b2c2a2b2+1c2a2b2c2+1∣ ∣ ∣
Using the transformation, C1C1+C2+C3
Δ=∣ ∣ ∣1+a2+b2+c2b2c21+a2+b2+c2b2+1c21+a2+b2+c2b2c2+1∣ ∣ ∣

=(1+a2+b2+c2)∣ ∣ ∣1b2c21b2+1c21b2c2+1∣ ∣ ∣
Applying R2R2R1 and R3R3R1
Δ=(1+a2+b2+c2)∣ ∣1b2c2010001∣ ∣

=(1+a2+b2+c2)

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