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You can use Excel or another spreadsheet to do the calculations. Put the numbers 1, 2, 3, ... in one column, the numbers 2, 3, 4, ... in the second column, and the product (for example, "=A1 * B1") in the third. Then add it all up.
There might be a shortcut to do this kind of calculation, but I don't know of any.
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Earn +20 ptsQ: What is the sume of 1x2 plus 2x3 plus 3x4 plus plus 2009x2010?
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Continue Learning about Math & Arithmetic
Factor 4x5 plus 6x3 plus 6x2 plus 9?
Rearrange: 4x5 + 6x2 + 6x3 + 9 Group: 2x2 (2x3 + 3) + 3 (2x3 + 3) Simplify to get your answer: (2x2 + 3) (2x3 + 3)
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