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104 - 4
(-----------) + 1 = 21. Jadi, bnyk suku adalah 21.
5
Sn = 1/2n (a + an)
Sn = 1/2 x 21 (4 + 104)
Sn = 10,5 (108)
Sn = 1134
Jadi, jumlahnya = 1134