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a = 1
sn = n/2 ((2a+(n-1)b)
S99 = 49,5 ((2.1+(99-1)2)
= 49,5((2+ (98x2)
= 49,5 ((2+196))
=49,5 x 198
= 9801
2+4+6+...+100=2550
2500-2550=-50