Complete the formulas

Exercise and reference answers

Missing parts

1. Answer

   d

   Choices

   1. d
   2. r
   3. n

2. Answer

   n - 1

   Choices

   1. n + 1
   2. n - 1
   3. 2n

3. Answer

   2

   Choices

   1. 4
   2. 2
   3. n

Complete the statement

Arithmetic nth term: a_n = a_1 + {0}(n - 1). Geometric nth term: a_n = a_1 * r^({1}). Arithmetic series: S_n = n(a_1 + a_n)/{2}.

Instructions

Tap the piece that fills each blank.

Explanation