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24000 = a+b(6-1)
24000 = a+5b
U10 = a+b(n-1)
18000 = a+b(10-1)
18000 = a+9b
cara eliminasi
a+5b =24000
a+9b =18000
₋₋₋₋₋₋₋₋₋₋₋₋₋₋ ₋
-4b =6000
b =6000 : -4
b = -1500
subtistusi ke pers 1
a+5b =24000
a+5(-1500) =24000
a-7500 =24000
a =24000+7500
a =31500
Un = a+b(n-1)
0 =31500+(-1500)(n-1)
0 =31500-1500n+1500
0 =31500+1500-1500n
1500n =33000
n = 33000 : 1500
n =22
jadi, agar n = 0, nilai n adalah 22