Question 2
Compute the following sums:
a) 1 + 2 + 3 + 4 + 5.
b) 1 + 2 + 3 + 4 + ⋯ + 18 + 19 + 20.
c) 2 + 5 + 8 + 11 + ⋯ + 32 + 35 + 38.
Self-study input convention (editorial): enter all three answers in order a;b;c, separated by semicolons.
**Editorial input note:** Use no spaces before or after semicolons.
a) 1 + 2 + 3 + 4 + 5.
b) 1 + 2 + 3 + 4 + ⋯ + 18 + 19 + 20.
c) 2 + 5 + 8 + 11 + ⋯ + 32 + 35 + 38.
Self-study input convention (editorial): enter all three answers in order a;b;c, separated by semicolons.
**Editorial input note:** Use no spaces before or after semicolons.