tolong dipakein caranya ok

1 + 98 - 99 = 0

2 + 3 + 4 + 5 +......+ 97
a = 2
b = 1
n = 97 - 1 = 96

Sn = 1/2(n) [2a + (n - 1) b]
S96 = 1/2(96)[2(2) + (96 - 1) × 1]
S96 = 48 × [4 + 95 × 1]
S96 = 48 × [4 + 95]
S96 = 48 × 99
S96 = 4752