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a= 5
Dit. S8(?)
Jawab....
U8 = a+7b= 54
@ 5 + 7b = 54
@ 7b = 49
@ b = 7
S8= n/2 × (2a+(n-1)b)
@ 8/2 × (2(5) + (8-1) 7)
@ 4 × (10 + 49)
@ 4 × 59
@ 236
9) 51+54+57+60+63+66+69+72+75+78+81+84+87+90+93+96+99+102+105+108+111+114+117+120+123+126+129+132+135+138+141+144+147 = 3267