2. Find the sum of the first 50 odd numbers.
3. In the series 2, 5, 8, ···, which term is 92?
4. How many terms must be taken from the series 3, 5, 7, ···, to make a total of 255?
5. Insert 5 arithmetical means between 11 and 32.
6. Insert 9 arithmetical means between
and 30.
7. Find x, if
