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U5=a+4b
29=a+4b... (1)
U11= a+10b
65 = a+10b..(2)
a+4b = 29
a+10b= 65 -
-6b = -36, maka b = 6,
a = 29-4(b)
a = 29-24
a=5
# U17 = a+16b
= 5 + 16(6)
= 101.
U11 = a+ 10b = 65
dikurang : -6b = -36
b= 6
a + 4(6) = 29
a + 24 = 29
a = 29 - 24
a = 5
Un = a + (n-1)b
U17 = 5 + (17 -16
= 5 + 16(6)
= 5 + 96
= 101