Introduction:
Inclusive series includes the starting point and the ending point, while exclusive series does not include the ending point. In this case, we will change the given inclusive series of (0-9, 10-19, 20-29, 30-39) into exclusive series.

Steps to Change Inclusive Series into Exclusive Series:
To change the given inclusive series into exclusive series, we need to follow the below steps:

1. Subtract 1 from the ending point of each series to exclude it from the range.
- For example, the inclusive series of (0-9) becomes (0-8) by subtracting 1 from 9.

2. Write the new series using the starting point and the adjusted ending point.
- For example, the new exclusive series of (0-8) becomes 0, 1, 2, 3, 4, 5, 6, 7, 8.

3. Repeat the same steps for all the given inclusive series.
- For example, the exclusive series for (10-19) becomes 10, 11, 12, 13, 14, 15, 16, 17, 18.
- The exclusive series for (20-29) becomes 20, 21, 22, 23, 24, 25, 26, 27, 28.
- The exclusive series for (30-39) becomes 30, 31, 32, 33, 34, 35, 36, 37, 38.

Conclusion:
In conclusion, changing the inclusive series into exclusive series involves subtracting 1 from the ending point and writing the new series using the starting point and the adjusted ending point. In this way, we can convert the given inclusive series of (0-9, 10-19, 20-29, 30-39) into exclusive series.

Lower limit of the 2nd class - upper limit of 1st class
divided by 2