Pake cara yaaa……​

Penyelesaian:

U6 = a + 5b = 35

U12 = a + 11b = 65

11b – 5b = 65 – 35

6b = 30

b = 5

a = 35 – 5b

a = 35 – 5(5)

a = 10

suku ke-50

U50 = a + 49b

U50 = 10 + 49 (5)

U50 = 255

Jumlah 50 suku pertama

Sn = n/2 (a + Un)

S50 = 50/2 (10 + 255)

S50 = 25 (265)

S50 = 6.625

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Detil Jawaban

Kelas: 11

Mapel: Matematika

Bab: Barisan dan Deret

Kode: 11.2.7

Kata Kunci: barisan aritmatika