a + 4b = 41
a + 10b = 23
____________-
-6b = 18
b = -3
a = 53
Un = a + (n-1)b
Un = 53 + 20 (-3)
Un = 53 - 60
Un = -7
Suku ke 21 = -7
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a + 4b = 41
a + 10b = 23
____________-
-6b = 18
b = -3
a = 53
Un = a + (n-1)b
Un = 53 + 20 (-3)
Un = 53 - 60
Un = -7
Suku ke 21 = -7