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b = 2
Un = a + (n-1)b
99 = 1 + (n-1)2
99 = 1 + 2n - 2
99 = -1 + 2n
2n = 100, n = 50
S50 = n/2 (2a + (n-1)b)
S50 = 25 (2 + (49)2)
S50 = 25 (2 + 98)
S50 = 25 (100)
S50 = 2500
Jadi, jumlah baris aritmatika adalah 2500
Semoga membantu :)