8. The constant term in expansion of \( (x-1 / x)^{12} \) is \( (a)^{-} 424 \) (b) 420 (c) \( -420 \) (d) 424
8. The coefficient term in expansion of \( (x-1 / x)^{12} \) is \( (a)^{-} 424 \) (b) 420 (c) \( -420 \) (d) 424
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