TMUA Beyond Horizon Set 3 Paper 1 · Question 2

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Beyond Horizon Set 3 Paper 1 · Q2

Paper 1Number & counting

Let $d_1,d_2,\ldots,d_k$ be all the factors of a positive integer $n$ including $1$ and $n$ . Suppose $d_1+d_2+\cdots+d_k=72$ . Find the value of

\frac{1}{d_1}+\frac{1}{d_2}+\cdots+\frac{1}{d_k}

\frac{k^2}{72}

\frac{72}{k}

\frac{72}{n}

\frac{72}{k^2}

\frac{72}{n^2}

Fcannot be found from the given information

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