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A very logical elementary school math problem
First question: Because the period after 1999 is 257 13, the four numbers 1999 should be removed, that is, 1000-4=9996.

9996/5= 1999 and 1, so the number 1000 is 2.

Second question: (1+9+9)+199x (2+5+7+1+3)+2 = 28+3582+2 = 3612.

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