Question: 7. For each n E N, let Mn denote the set of all positive ndigit integers that do not contain the digit 9 and let

7. For each n E N, let Mn denote the set of all positive ndigit integers that do not contain the digit \"9\" and let S = U211 Mn. Consider the series 1 gm Which is obtained by taking the harmonic series and removing all terms of the form % where mS. (a) For a given fixed n E N, with justification, calculate the cardinality of the set Mn.(b) Using part (a), or otherwise, prove that the series _mes m converges

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