Question

Perhatikan barisan bilangan berikut 3,7,11,15,...79,83 banyak suku pd bilangan tersebut adalah

Answer 1

Verified answer

Kelas 8 Matematika
Bab Barisan dan Deret Bilangan

3, 7, 11, 15, .., 79, 83

b = U2 - U1
b = 7 - 3
b = 4

Un = 83
a + (n - 1) . b = 83
3 + (n - 1) . 4 = 83
(n - 1) . 4 = 83 - 3
n - 1 = 80/4
n = 20 + 1
n = 21

Banyak suku = 21