Barisan Aritemtika suku ke 4 = 17 dan suku 9 = 37 tentukan suku ke 50

Jawaban:

• Barisan dan Deret

U4 = 17

a + 3b = 17

U9 = 37

a + 8b = 37

a = a

17 – 3b = 37 – 8b

5b = 20

b = 4

a = 17 – 3b

a = 17 – 3(4)

a = 17 – 12

a = 5

U50 = a + 49b

U50 = 5 + 49(4)

U50 = 5 + 196

U50 = 211