Respuesta :

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a(1)=2*5^1-1=2*5^0=2*1=2
a(4)=2*5^4-1=2*5^3=2*125=250 
a(8)=2*5^8-1=2*5^7=2*78,125=156,250

Answer: 2, 250, 156, 250

Step-by-step explanation: