tolong bantu ya kak di kumpul besok

Penyelesaian:

Barisan bilangan ganjil:
1, 3, 5, 7, 9, 11 ...
a = 1 
b = 2

Sn = n/2 (2a + (n-1)b
= 17/2 (2(1) + (16)2
= 17/2 (2+32)
= 17/2 (34)
= 17.17
= 289 (C).