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to calculate it take the highest number 100 multiply it by the same number plus 1 then divide by 2(100 x (100+1))/2 = (100x101)/2 = 10100/2 = 5050
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to calculate it take the highest number 100 multiply it by the same number plus 1 then divide by 2(100 x (100+1))/2 = (100x101)/2 = 10100/2 = 5050