1. beda dan suku awal
a. -29, -22, -15
b= -22-(-29) =7
a= -29
b. 73, 64, 55
b= 64-73= -9
a= 73
2. 24+18+12+6..
jumlah suku ke 40
= a= 24
b= -6
3. u1= -15
u25= 81
jumlah suku 25
u25= a+(25-1)b
a+24b= 81
-15+24×b=81
9b=81
b=81/9=9
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1. beda dan suku awal
a. -29, -22, -15
b= -22-(-29) =7
a= -29
b. 73, 64, 55
b= 64-73= -9
a= 73
2. 24+18+12+6..
jumlah suku ke 40
= a= 24
b= -6
3. u1= -15
u25= 81
jumlah suku 25
u25= a+(25-1)b
a+24b= 81
-15+24×b=81
9b=81
b=81/9=9