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Firstly ,you must do this

1000+1,so every you see this kind of question,add the last number and the first number together.So as for this,1000+1=1001

Next step is to get 1000 divide by 2 to get how many sets of 1001.And the answer is 500.

Last step is 500x1001=500500.

So the answer is 500500.!

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13y ago

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