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Verified answer
Mapel : Matematikabab : Barisan dan deret
2 + 5 + 8 + 11 + ....
a = 2
b = 5 - 2 = 3
Sn = n/2(2a + (n - 1) b)
S30 = 30/2 (2(2) + (30 - 1) 3)
S30 = 15 (4 + 87)
S30 = 15 × 91
S30 = 1.365
Verified answer
Diketahui =a = 2
b = 3
Ditanya S30 (Jumlah 30 suku pertama)
Sn = 1/2 . n . (U1 + Un)
Cari dulu U30 nya
Un = a + (n-1)b
U30 = 2 + (30-1)3
= 2 + (29)3
= 2 + 87
= 89
S30 = 1/2 . 30 . (2+89)
= 15 . 91
= 1365