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(sum_(j=0)^499(abs(0.1+2*j))*(-1)^j - (sum_(j=0)^499abs(0.1+2*j+1)*(-1)^j
(sum_(j=0)^499(abs(0.1+2*j))*(-1)^j - (sum_(j=0)^499abs(0.1+2*j+1)*(-1)^j
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