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The sum of the co-efficients of all even degree terms in $x$ in the expansion of $\left(x + \sqrt{x^3 - 1}\right)^6 + \left(x - \sqrt{x^3 - 1}\right)^6$, $(x > 1)$ is equal to:
(1) 29 (2) 32 (3) 26 (4) 24
Expanding and collecting even degree terms: sum $= 24$.
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