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Mathematics 12 Online
OpenStudy (samigupta8):

if 1.3+2.3^2+3.3^3+.........+n.3^n=(2n-1)3^a+b/4 then (a,b) is

OpenStudy (shubhamsrg):

Go for hit and trial make 2 equations by taking n=1 first, then n=2

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