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( 26 - 8 ) : ( 11 - 5 ) = 3
Awal :
8 = a + 4b
8 = a + 12
a = -4
Jumlah 25 suku pertama :
S₂₅ = 25 : 2 ( 2 × -4 + ( 25 - 1 ) 3 )
= 12,5 ( -8 + 24 × 3 )
= 12,5 × 64
= 800