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u17 = 40
b = 40 - 10 = 30 = 5
17 - 11 6
U1+10b = 10
U1+ 10.5 = 10
u1 = 10-50
u1 = -40
Sn = 1/2 n (2U1+(n-1).b)
S50 = 1/2.50 (2.-40+(50-1).5
S50 = 25.(-80+245)
S50 = 25. 165
S50 = 4125