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a+5b=18
a+15=18
a=3
s16=16/2(2*3+15(3))=408
( 30 - 18 ) : ( 10 - 6 ) = 3
Cari awal :
18 = a + 5b
18 = a + 15
a = 3
Maka, jumlah 16 suku pertma :
S₁₆ = 16 : 2 ( 2 × 3 + ( 16 - 1 ) 3 )
= 8 ( 6 + 15 × 3 )
= 8 × 51
= 408