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50 = 1 + 2n - 2
50 = 2n - 1
51/2 = n
Sn = n/2(2a+(n-1)b)
Sn = 51/4(2 + 2n - 2 )
Sn = 51(2n)/4
Sn = 51n/2
Sn = (51(51/2))/2
Sn = 51'2/2'2