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Prove that by using the principle of ma...

Prove that by using the principle of mathematical induction for all `n in N`:
`1+ 3+ 3^(2)+ …. + 3^(n-1)= ((3^(n)-1))/(2)`

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NCERT BANGLISH-PRINCIPLE OF MATHEMATICAL INDUCTION-EXERCISE - 4.1
  1. Prove that by using the principle of mathematical induction for all n...

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  2. Prove that by using the principle of mathematical induction for all n...

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