Lesson: Sum of a Finite Geometric Sequence Mathematics • Second Year of Secondary School

Students will be able to

• recall the formula for the sum of a finite geometric sequence,
• calculate the sum of a specified number of terms in a geometric sequence when given
  • the first three (or more) terms of the sequence and the total number of terms,
  • the first three (or more) terms of the sequence and the last term,
  • any numbered term and the common ratio,
  • any numbered term and the sum of two or more numbered terms,
• calculate the number of terms in a geometric sequence when given its sum and any sufficient information,
• find a geometric sequence when given
  • the sum of and the number of terms,
  • the sum of two groups of numbered terms,
  • the sum of more than two terms and the common ratio,
  • the sum and the first and last terms.