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[sum(r=0)^(n)(-1)^(r)*C(r)*((1+r ell n u...

[sum_(r=0)^(n)(-1)^(r)*C_(r)*((1+r ell n uarr0))/((1+ell n10^(n))^(r))=],[([A,0]]quad [(1+r ell n uarr0)],[(1+ell n uarr0^(n))^(r)],[quad (B)1/2]

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