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a + 2b = 8
a + 6b = 20
----------------- -
-4b = -12
b = 3
a + 2(3) = 8
a + 6 = 8
a = 8 - 6 = 2
jadi, a = 2 dan b = 3
U25 = 2 + 24(3)
= 2 + 72
= 74
---------------------------------------------
U7 = a + (7-1)b = 20
U3 = a + (3-1)b = 8 -
(4)b = 12
b = 12 : 4
b = 3
-----------------------------------------------
a + ( 3 - 1 ) b = U3
a + 2b = 8
a + 2 ( 3) = 8
a + 6 = 8
a = 8 - 6
a = 2
------------------------------------------------
Un = a + (n - 1)b
U25 = 2 + (25 - 1)3
= 2 + (24) 3
= 2 + 72
= 74