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( a + 7b ) - ( a + 4b ) = 24
( 6 + 7b ) - ( 6 + 4b ) = 24
3b = 24
b = 8
Jumlah 60 suku pertama :
S₆₀ = 60 : 2 ( 6 × 2 + ( 60 - 1 ) 8 )
= 30 ( 12 + 59 × 8 )
= 30 × 484
= 14.520