Answer :
First term, t1 = 1
Second term t2 = 5*t1 = 5
Third term t3 = 5*t2 = 5*5 = 25
Fourth term t4 = 5*t3 = 5*25 = 125
Fifth term t5 = 5*t4 = 5*125 = 625
Second term t2 = 5*t1 = 5
Third term t3 = 5*t2 = 5*5 = 25
Fourth term t4 = 5*t3 = 5*25 = 125
Fifth term t5 = 5*t4 = 5*125 = 625