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( 38 - 18 ) : ( 7 - 3 ) = 4
Cari awal :
18 = a + 2b
18 = a + 8
a = 10
Jumlah 24 suku pertama :
S₂₄ = 24 : 2 ( 10 × 2 + ( 20 - 1 ) 4 )
S₂₄ = 12 ( 20 + 76 )
S₂₄ = 12 × 96
S₂₄ = 1.152