Diketahui barisan aritmetika dengan U4= 20 dan U8= 44. Suku ke-40 baris itu adalah…
Maulida fadhilaProfessional
Diketahui barisan aritmetika dengan U4= 20 dan U8= 44. Suku ke-40 baris itu adalah…
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Substitusi nilai b ke satu diantara persamaan di atas, maka:
20 = a + 3b
20 = a + 3(6)
20 = a + 18
2 = a
Maka suku ke-40 barisan tersebut adalah
U40 = 2 + (39) 6 = 236