Jawab:
756
Penjelasan dengan langkah-langkah:
a = 6
b = 3
Un = 66
a + (n - 1) . b = 66
6 + (n - 1) . 3 =66
(n - 1) . 3 = 66 - 6
n - 1 = 60 / 3
n = 20 + 1
n = 21
Sn = n/2 . (a + Un)
S21 = 21/2 . (6 + 66)
S21 = 10,5 . 72
S21 = 756
Kode kategorisasi : 9.2.6
Kelas 9
Pelajaran Matematika
Bab 6 - Barisan dan Deret Bilangan
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Jawab:
756
Penjelasan dengan langkah-langkah:
a = 6
b = 3
Un = 66
a + (n - 1) . b = 66
6 + (n - 1) . 3 =66
(n - 1) . 3 = 66 - 6
n - 1 = 60 / 3
n = 20 + 1
n = 21
Sn = n/2 . (a + Un)
S21 = 21/2 . (6 + 66)
S21 = 10,5 . 72
S21 = 756
Kode kategorisasi : 9.2.6
Kelas 9
Pelajaran Matematika
Bab 6 - Barisan dan Deret Bilangan