Question Number 177711 by infinityaction last updated on 08/Oct/22
$$\frac{\mathrm{4}}{\mathrm{20}}+\frac{\mathrm{4}.\mathrm{7}}{\mathrm{20}.\mathrm{30}}+\frac{\mathrm{4}.\mathrm{7}.\mathrm{10}}{\mathrm{20}.\mathrm{30}.\mathrm{40}}+….. \\ $$
4-20-4-7-20-30-4-7-10-20-30-40-