Banyak pola pada susunan ke 10 adalah ….

Un = a + (n – 1)b

U1 = 1
U2 = 5
U3 = 9
U4 = 13

U3 = a + 2b → a + 2b = 9
U2 = a + b → a + b = 5

a + 2b = 9
a + b = 5
_________-
b = 4

a + b = 5
a + 4 = 5
a = 5 – 4
a = 1

U10 = a + (10 – 1)b
= 1 + (9)4
= 1 + (9 × 4)
= 1 + 36
= 37 {C}

Semoga bermanfaat ^_^
Selamat belajar !!!

Jawabanya 37
insya allah