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Prove the following by using the princip...

Prove the following by using the principle of mathematical induction for all `n in N`
`1.3+2.3^2+3.3^3 + ……….+n.3^n = ((2n-1)3^(n+1) + 3)/(4)`

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NCERT GUJARATI-PRINCIPLE OF MATHEMATICAL INDUCTION-EXERCISE - 4.1
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