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a = 251 , b = 1 , n = (999 - 251) + 1 = 749, dan Un = 999
Sn = (n/2)(a + Un)
S749 = (749/2)(251 + 999)
= (749/2)(1250)
= 749 x 625
= 468125
Jadi, jumlah bilangan bulat antara 250 sampai 1000 adalah 468125