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U? = 395
b = 5
= 205 + (n-1) 5 = 395
= 205 + 5n - 5 = 395
= 200 + 5n = 395
5n = 395 - 200
5n = 195
n = 39
39/2.(2.205 + (39-1)5)
39/2 (410 + 38.5)
39/2 (600)
11700