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  1. B

    Binomial theorem-related proof

    In = an+3 + (a+1)2n+3 , when n=-1 and n=0 it can be shown that it is divisible by a2+a+1 In+1 = an+4 + (a+1)2n+5 In+1 - In = (an+4 - an+3) + [(a+1)2n+5 - (a+1)2n+3] which can be ultimately reduce to In+1 = a.In + (a2+a+1).(a+1)2n+3 So, by induction method u can prove. Not true for n less than -1.
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