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b = 5 - 2 = 3
Un = 68
a + (n - 1)b = 68
2 + 3(n - 1) = 68
- 1 + 3n = 68
3n = 69
n = 23
banyaknya suku = 23
b = 5-2 =3
Un = a + (n-1)b =68
2 + (n-1)3 = 2 + 3n -3 =3n -1 =68
3n = 68 +1
n = 69/3 = 23
jadi banyak sukunya adalah 23