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Soal A . S10 = 1/2 . 10 (2.2 +9.6)
= 5 (4+54)
= 290
Soal B . S20 = 1/2 . 20 (2.-22+19.6)
= 10 (-44+114)
= 700
Ket . a = suku pertama
b = beda
n = banyaknya suku