Jawabanmu

2014-03-02T15:47:59+07:00
(2x +1)+ (2x+2)+(2x+3)+...+(2x +50)=4275
2x(50) + 1 + 2 +...+ 50 = 4275
100x + (1+50)/2 x 50 = 4275
100x = 4275 - 1275
x = 3000 / 100 = 30
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