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maka b = 1
sn = n/2(2a + (n-1)b)
S97 = 97/2 (2a + 96(1))
137 = 97/2 (2a + 96)
274 = 97 (2a + 96)
274 = 194a + 9312
-9038 = 194a
a = - 9038/194
f(1) = -9038/194
f(2) = -9038/194 + 1
f(2) = -8844/194
f(2)+f(3)+ ... + f(98) = 97/2 (2(-8844/194) + 96(1))
= 97 ( -8844/194 + 48)
= 97 (468/194)
= 234
Jadi jumlahnya 234