01 = 16 02 = 64 03 = 256 04 = 1,024 05 = 4,096 06 = 16,384 07 = 65,536 08 = 262,144 09 = 1,048,576 10 = 4,194,304 11 = 16,777,216 12 = 67,108,864 13 = 268,435,456 14 = 1,073,741,824 15 = 4,294,967,296 16 = 17,179,869,184 17 = 68,719,476,736 18 = 274,877,906,944 19 = 1,099,511,627,776 20 = 4,398,046,511,104
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-the first 10 multiples of 20 are 20,40,60,80,100,120,140,160,180, and 200. :)
5, 10, 15, 20
5 + 10+15+20=50 ans
-15
They are 20, 40, 60, 80, 100.