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( -5 - 9 ) : ( 14 - 7 ) = -2
Awal :
9 = a + 6b
9 = a - 12
a = 21
Jumlah 101 suku pertama :
S₁₀₁ = 101 : 2 ( 2 × 21 + ( 101 - 1 ) × -2 )
= 50,5 ( 42 + 100 × -2 )
= 50,5 × -158
= -7.979