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( 30 - 18 ) : ( 10 - 6 ) = 3
Awal :
18 = a + 5b
18 = a + 15
a = 3
Jumlah 16 suku pertama :
S₁₆ = 16 : 2 ( 2 × 3 + 15 × 3 )
= 8 × ( 6 + 45 )
= 8 × 51
= 408