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b = 204-207 = -3
Sn = 1/2n (2a+(n-1)b
S35 = 1/2 . 35. ( 2 . 207 + (35-1) -3 )
S35 = 1/2 . 35 (414 - 102)
S35 = 17,5 (312)
S35 = 5460
b=(-3)
Sn=1/2n(2a+(n-1)b)
S30=1/2x35(2x207+(35-1).-3)
17,5(414+(34.-3))
17,5x(414-102)
17,5x312
=5460