why's submissions for 1042 求等差数列的和

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why
on Nov. 4, 2010, 10:16 a.m.
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IR | C
why
on Nov. 4, 2010, 10:15 a.m.
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IR | C
why
on Nov. 4, 2010, 10:14 a.m.
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why
on Nov. 4, 2010, 10:11 a.m.
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