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2014-03-07T19:51:40+07:00
Α = 10
b = 5
Sn = n/2 (2.α + (n - 1) b)
S40 = 40/2 (2.10 + (40 - 1) 5)
S40 = 20 (10 + 195)
S40 = 20 . 205
S40 = 4.100
1 5 1