1.

If f(x)=∣∣∣∣∣1+xn(1−x)n2+xn(2+x)n(2+x)n1(3−x)n13+x∣∣∣∣∣,then the constant term in the expansion is

Answer» If f(x)=∣∣
∣
∣
∣
1+xn(1−x)n2+xn(2+x)n(2+x)n1(3−x)n13+x∣∣
∣
∣
∣
,

then the constant term in the expansion is


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