Question

Dik ; suku ke-5 = 23
suku ke-75 = 303
dit : a dan b?

dik : suku ke-4 = 19
suku ke-80 = 247
dit : suku ke-100?

Answer 1

1. U5 = 23
U75 = 303

U75-U5 = 303-23
a+74b - a+4b = 
70b = 280
b = 4

U5 = a + 4b
23 = a+4x4
23 = a + 16
7 = a

2. U4 = 19
U80 = 247

U80-U4 = 247-19
a+79b - a+3b = 228
76b = 228
b = 3
U4 = a + 3b
19 = a + 3x3
19 = a +9
10 = a

U100 = a+99b
U100 = 10 + 99 x 3
U100 = 10 + 297
U100 = 307

Maaf kalau salah