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a= 2
b = 2
Un = 30
Un = a+(n-1)b
30 = 2+(n-1)2
30-2 = 2(n-1)
28 = 2(n-1)
28/2 = N-1
14= n-1
15 = n
Sn = n/2 (a+Un)
S15 = 15/2 (2+30)
S15 = 7,5 x 32
S15 = 240