The total is 465
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The sum of whole numbers 1 through 30 is 465.
(30 + 1) * 30/2 ie 465
The product of a sum and a difference with 31 times 29 is:(30+1) x (30-1)sum to differencemakea product= 30² - 1²= 900 - 1= 899
465
1+30=31 and 1x30=30