NDA Math Matrices

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Question : 18 of 69
 
Marks: +1, -0
If f(x)=|
1xx+1
2xx(x−1)x(x+1)
3x(x−1)2(x−1)(x−2)x(x+1)(x−1)
|
then what is f(−1)+f(0)+f(1) equal to?
[NDA-I 2021]
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