Question

Find the sum of multiple of s
below 1000​

Answer 1

Answer:

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Step-by-step explanation:

Since we are asked to look for numbers below 1000, we shall look at numbers up to the number 999. To find n, use 999/3 = 333 + remainder, 999/5 = 199 + remainder, 999/15 = 66 + remainder, by using a*(m*(m+1)/2) , where m=n/a.