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Question

Evaluate :

1abc1bca1cab

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Solution

=1abc1bca1cab When a=b, the first two rows become identical. Hence, a-b is a factor. Similarly, when b=c and c=a, the second and third and third and first rows become identical. Hence, b-c and c-a are also factors. The degree of product of the diagonal elements is 3. Hence, there are no other factors. 1abc1bca1cab=λ(a-b)(b-c)(c-a) Where λ is a constant102110120=2λ Putting a=0, b=1 and c=2 to find λ2=2λλ=1Hence,1abc1bca1cab =(a-b)(b-c)(c-a)

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