Question 13
Evaluate:
a) $A = 1 + 2 + 3 + 4 + 5 + … + 2020$.
b) $B = 2 + 4 + 6 + 8 + … + 2020$.
c) $C = 1 + 3 + 5 + 7 + … + 2019$.
Answer entry: Enter A; B; C in order, with no thousands separators.
**Editorial input note:** Use no spaces before or after semicolons.
a) $A = 1 + 2 + 3 + 4 + 5 + … + 2020$.
b) $B = 2 + 4 + 6 + 8 + … + 2020$.
c) $C = 1 + 3 + 5 + 7 + … + 2019$.
Answer entry: Enter A; B; C in order, with no thousands separators.
**Editorial input note:** Use no spaces before or after semicolons.