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The sum of all natural numbers less than 300 divisible by 3 but not multiples of 5 is ()
The sum of all natural numbers less than 300 divisible by 3 is:
3+6+9+...+297=99(3+297)/2=14650
The sum of all natural numbers that can be divisible by both 3 and 5 is:
15+30+...+285=19(15+285)/2=2850
Therefore: the sum of all natural numbers less than 300 that can be divided by 3 but not multiples of 5 is 14650-2850 = 11800
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