Find the sum of all the multiples of 6 between 200 and 400.
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therefore space S subscript 29 space equals space 29 over 2 space open parentheses 203 space plus space 399 close parentheses
space space space space space space space space space space space space space equals space 29 over 2 space open parentheses 602 close parentheses
space space space space space space space space space space space space space equals space open parentheses 29 close parentheses open parentheses 301 close parentheses
space space space space space space space space space space space space space equals space 8729
Thus, the required sum is 8729.
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