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b = U2 - U1 = 4-1 = 3
U1000 ?
U1000 = a + ( n - 1 ) b
= 1 + ( 1000 - 1 ) 3
= 1 + ( 999 ) 3
= 1 + 2997
= 2998
jd suku ke 1000 adalah 2998