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u11 = 34
22 = u1 + 6b
34 = ui + 10b
_____________ -
- 12 = -4b
b = 3
22 = u1 + 6b
22 = u1 + 6.3
ui = 22 - 18
ui = 4
s18 = n:2 (2u1 + (n-1) b)
s 18 = 18 :2 ( 2.4 + (17) 3 )
s 18 = 9 ( 8 + 51 )
s 18 = 9 ( 59)
s 18 = 531