Work Step by Step
According to the exercise: $a_1=4$ $a_2=5a_1=5(4)=20$ $a_3=5a_2=5(20)=100$ $a_4=5a_3=5(100)=500$ $a_5=5a_4=5(500)=2500$ $a_6=5a_5=5(2500)=12500$
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