tolong pakai caranya yha...makasih kalau udah bisa menjawab

44, 48,......... 148
a = 44
b = 4
Un = 148
a + (n-1)b = 148
44 + (n-1)4 = 148
44 + 4n - 4 = 148
4n = 148 - 40
4n = 108
n = 27

s27 = 27/2( 2(44) + 26(4))
s27 = 27/2 (88+104)
s27= 2.592

Jawabannya C