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Suku ke 6 = a+5b = 10
Suku ke 25 = a+24b = 67 -
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Eliminasi = -19b = -57
b = -57 ÷ -19 = 3
substitusikan
a+ (5.3)= 10
a + 15 = 10
a = 10-15
a= -5
U17 = a+(17-1)b
= -5 + 16 . 3
= -5 + 48
= 43
A+5b=10
A+24b=67
------------ -
-19b=-57
B=3
A+5.3=10
A=-5
U17=a+(n-1)b
=-5+16.3
=43