a) $$\frac{{{\text{m}} + {\text{n}}}}{{{\text{mn}}}}$$
b) $$\frac{{{\text{r}}\left( {{\text{m}} + {\text{n}}} \right)}}{{{\text{mn}}}}$$
c) $$\frac{{{\text{m}} + {\text{n}}}}{{{\text{mr}}}}$$
d) $$\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$$
Answer: d
Explanation: M1 × D1 = M2 × D2
mr = (m +n) × D2
D2 = $$\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$$
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