a. Let a1,  a2,a3....b1,b2,b3...All satisfy the recurrence relation that the kth term equals 3times the (k-1)at term for all integers k≥1: ak= 3ak-1,bk=3bk-1,ck=3ck-1. But suppose the initial condition was a1=1, b1=0 and c1=2. Find:- A4, a6 ,a7  b2, b4, b5

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