The sum of the integers between 200 and 400, that are multiples of 7, is:
Multiples of 7 between 200 and 400: the first is 203 (7 × 29) and the last is 399 (7 × 57).
Number of terms = 57 − 29 + 1 = 29
Sum = \(\frac{29}{2}(203 + 399) = \frac{29 \times 602}{2} = 29 \times 301 = 8729\)
Answer: (A) 8729
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