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3 + (8 - 1)b = 24
3 + 7b = 24
7b = 21
b = 3
b. Deret Aritmetika : 3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27 + 30 + .... dst
c. Jumlah 10 suku pertama :
S10 = n÷2 [2a + (n-1)b]
S10 = 10÷2 [2(3) + (10-1)3]
S10 = 10÷2 [6 + 27]
S10 = 10÷2 [33]
S10 = 5 [33]
S10 = 165
Semoga dapat membantu, mohon dikoreksi. Trims
u8=a+7b=24
3+7b=24
7b=21
b=3
B. Deret aritmatika
3+6+9+12+15+18+21+24+27+30+.....