Question
In the given figure, find $\angle A +\angle B +\angle C +$ $\angle D +\angle E +\angle F$.



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(i) expression for the smallest number and the largest number.
(ii) the three numbers.
| Contents of air | Percentage (by volume) |
| Nitrogen | $78$ |
| Oxygen | $21$ |
| Other (carbon dioxide, inert gases, water vapours, etc.) | $1$ |
