Fill in the three series formulas

Exercise and reference answers

Missing parts

1. Answer

   n(a_1 + a_n)/2

   Choices

   1. n(a_1 + a_n)
   2. (a_1 + a_n)/2
   3. n(a_1 + a_n)/2

2. Answer

   a_1(1 - r^n)/(1 - r)

   Choices

   1. a_1(1 - r^n)/(1 - r)
   2. a_1(1 - r)/(1 - r^n)
   3. a_1(1 + r^n)/(1 + r)

3. Answer

   a_1/(1 - r)

   Choices

   1. a_1/(1 + r)
   2. a_1/(1 - r)
   3. a_1 r/(1 - r)

Complete the statement

Arithmetic sum: S_n = {0} Geometric sum: S_n = {1} Infinite geometric sum: S = {2}

Instructions

Tap a chip to fill each blank so every sum formula is correct.

Explanation