# Let's start the counting today

Discrete Mathematics Level 3

My friend Ashish and I were counting numbers up to 1000. He counted multiples of 3 up to 1000, that is 3, 6, 9, ... 999. I counted multiples of 5, that is 5, 10, 15, ... 1000. How many numbers had we together counted, if a number could only be counted once?

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