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a = 201
b = 3
un = a + (n-1)b
297 = 201 + (n-1)3
297 = 201 + 3n - 3
297 = 198 + 3n
297 - 198 = 3n
99 = 3n
99/3 = n
33 = n
sn = n/2 (a + un)
s33 = 33/2 (201 + 297)
s33 = 33/2 (498)
s33 = 8217
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