1) 3599
2) 39999
3) 4896
5) 3025-2025=1000
6) 1681-961=720
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1) 3599
2) 39999
3) 4896
5) 3025-2025=1000
6) 1681-961=720
3) 199•201=39999
4) 72•69=4896
5) 55^2-45^2=1000
6) 41^2-31^2=720