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( 40 - 10 ) : ( 17 - 11 ) = 30 : 6 = 5
Awal :
10 = a + 10b
10 = a + 50
a = -40
Jumlah 50 suku pertama :
S₅₀ = 50 : 2 ( 2 × -40 + ( 50 - 1 ) × 5 )
= 25 ( -80 + 49 × 5 )
= 25 × 165
= 4.125