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4,11,18,25,32,39
2. suku 1 + suku 2 = suku 3
suku 2 + suku 3 = suku 4
Un = U(n-1) + U(n-2)
1,3,4,7,11,18,29,47
b = U2 - U1 = 11-4 = 7
U4 = 25+7 = 32
U5 = 32+7 = 39
No 2
U1 + U2 = U3
U2 + U3 = U4
Maka :
U7 = U5 + U6 = 11+18 = 29
U8 = U6 + U7 = 18+29 = 47