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The sum of the binomial coefficients of `[2x+1/x]^n` is equal to `256.` The constant term in the expansion is: (A) 1120 (B) 2110 (C) 1210 (D) none
A. `""^(8)C_(4)`
B. `""^(8)C_(4)xx2^(4)`
C. `""^(6)C_(4) xx2^(4)`
D. none of these

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