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To find the sum of all 3-digit numbers that leave a remainder of 5 when divided by 7, we first identify the smallest and largest 3-digit numbers in this category. The smallest is 105 (since (105 \mod 7 = 5)) and the largest is 995 (since (995 \mod 7 = 5)). These numbers form an arithmetic sequence with a common difference of 7. The number of terms can be found using the formula for the nth term of an arithmetic sequence, and the sum can then be calculated using the sum formula (S_n = \frac{n}{2} (a + l)), where (a) is the first term, (l) is the last term, and (n) is the number of terms. The sum of these numbers is 71,500.

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2d ago

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