Yang pintar MTK tolong bantu jawab!!​

Jawaban:

1.14,17,20

2.49

3.a.1,4,7,10=ya karena 1,4,7,10

b.2,5,7,9=bukan,harusnya 2,5,8,11

4.a = suku awal / suku pertama

U2 = 3 + (2-1)b

5 = 3 + b

b = 5 – 3 = 2

jadi nilai a=3, b=2

5.69 = 1 + (n-1) 4

69 = 1 + 4n – 4

69 = 4n – 3

4n = 72

n = 18