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Un=U1 r^n-1
U6=U1 4^6-1
U6=U1 4^5
1024=U1 (1024)
Despejas U1
U1=1
Un=U1 r^n-1
U3=1 4^3-1
U3=1(16)
U3=16
La progresión es esta:
1,4,16,64,256,1024..
Razón:4
Saludos y suerte !