P(n) = 10n + 3.4n+2 + 5 is divisible by 9.
For n = 1,
Hence, the given statement is true for n = 1,
i.e, P(1) is true
Let the statement P(m) is true i.e,
Hence, the given statement is true for n = m + i,
i.e., P(m + 1) is true.
Hence, P(n) is true for each natural number n ∈ N.
Hence Proved.