guys 1st questions answer fast
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for n=1
lhs=1
rhs=1
ie. statement is true for n=1
let the statement is true for n=k
1+3+3^2+....+3^k-1=(3^k-1)/2
we will prove for n=k+1
1+3+3^2+...+3^k-1+3^k=(3^k+1)/2
lhs=1
rhs=1
ie. statement is true for n=1
let the statement is true for n=k
1+3+3^2+....+3^k-1=(3^k-1)/2
we will prove for n=k+1
1+3+3^2+...+3^k-1+3^k=(3^k+1)/2
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