If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.
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def mult_3_5():
for num in range(1000):
if not num % 3 or not num % 5:
yield num
print (sum(mult_3_5()))
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