WBJEE 2018 Math Solved Paper

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Question : 64 of 75
 
Marks: +1, -0
If the polynomial f(x) = |
(1+x)a(2+x)b1
1(1+x)a(2+x)b
(2+x)b1(1+x)a
|
, then the constant term of f(x) is
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