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How much is 1 added to 1580?
You can use arithmetic progression to ask.

The sum of the first item and the last item (that is, (1+ 1580)) is multiplied by the number of items (that is, 1580) and then divided by 2.

The end result is:

( 1+ 1580)* 1580/2= 1248990

Remember this in the future, arithmetic progression.

Very useful

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