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26 = U1 + 1b + U1 + 15b
26 = 2U1 + 16b
13 = U1 + 8b
15 = U1 + 7b
13 = U1 + 8b
_________ -
2 = -b
b = -2
U1 = 29
Suku ke 10
29 + (10-1)× -2 = 29 + 9× -2 = 29 +(-18)
= 11
a. U1 = 29
Beda = -2
b. Suku ke 10 = 11