Mathbound
Sign up

AMC / AIME · Arithmetic Sequences · Medium

Arithmetic Sequences: Find the sum of the first math terms of math.

Common differences.

Try the problem

Find the sum of the first 2020 terms of 4,7,10,…4,7,10,\ldots.

Hint and answer

Concept to use

Sums.

Hint

For sums, pair first and last terms or use Sn=n2(a1+an)S_n=\frac n2(a_1+a_n).

Answer

650

More Arithmetic Sequences problems

Practice more with the free Arithmetic Sequences worksheet generator, or browse the full problem library.