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Verified answer
U6 = a+5b = 17U3 = a+2b = 8
___________ _
3b = 9
b = 3
a+2b = 8
a+2(3) = 8
a+6 = 8
a = 2
U8 = a+7b
U8 = 2+7(3)
U8 = 2+21 = 23
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Verified answer
Un = a + (n-1) bU3 = a + (3-1)b
U3 = a + 2b
8 = a + 2b
U6 = a + (6-1)b
U6 = a + 5b
17 = a + 5b
8 = a + 2b
17 = a + 5b
_________ -
-9 = -3b
b = -9/-3
b = 3
8 = a + 2b
8 = a + 2(3)
8 = a + 6
a = 8 - 6
a = 2
Maka
U8 = a + (8-1)b
U8 = 2 + 7(3)
U8 = 2 + 21
U8 = 23