The first 20 multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140.
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140,280,420
-the first 10 multiples of 20 are 20,40,60,80,100,120,140,160,180, and 200. :)
5 + 10+15+20=50 ans
The first 3 multiples of 7 are: 7, 14, and 21.
-15