Question

find the sum of multiples of 3 upto 1000​

Answer 1

Answer:

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here a is 3 or 5 or 15, and n is 999 or

1000 but 999 is best, and then sum

multiples of 3:

3((333) (333+1)/2)=166833 plus

multiples of 5:

5(199)-(199+1)/2)=99500; and

subtract multiples of 15 15((66)+

(66+1)/2)=33165 to get 233168.

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