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bentuk jumlah datanya kan gini
a + (a+1) + (a+2) + (a+3) + ... + (a+999)
(1000a + (1+2+3+...+999))/1000 = 2012
1000 a + 499500 = 2012 x 1000
2012000 - 499500 = 1000a
a= 1512500/1000
= 1512.5