Jawab:
3
Penjelasan dengan langkah-langkah:
Diketahui : S7 = 112 dan a = 4
Sn = 0,5n [2n +(n-1)b]
S7 = 112
(0,5x7) [2x7 +(7-1)b] = 112
3,5 [14 + 6b] = 112
49 + 21b = 112
21b = 112-49
21b = 63
b = 3
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Verified answer
Jawab:
3
Penjelasan dengan langkah-langkah:
Diketahui : S7 = 112 dan a = 4
Sn = 0,5n [2n +(n-1)b]
S7 = 112
(0,5x7) [2x7 +(7-1)b] = 112
3,5 [14 + 6b] = 112
49 + 21b = 112
21b = 112-49
21b = 63
b = 3