Sn = ½n (2a + (n-1)b)
S80 = ½.80 (2.1 + (80-1)1)
= 40 ( 2 + 79)
= 40 x 81
= 3240
Halaman yang belum dihitung = 3240 - 3214
= 26
× Mohon maaf bila ada kesalahan. Semoga membantu^^ ×
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Sn = ½n (2a + (n-1)b)
S80 = ½.80 (2.1 + (80-1)1)
= 40 ( 2 + 79)
= 40 x 81
= 3240
Halaman yang belum dihitung = 3240 - 3214
= 26
× Mohon maaf bila ada kesalahan. Semoga membantu^^ ×