Math Problem Statement

1st term of a geometric progression is -2 common ratio is -3 find sum of 1st 10 terms

Solution

To find the sum of the first 10 terms of a geometric progression (GP), we can use the formula for the sum of the first nn terms of a GP:

Sn=a1(1rn)1rS_n = \frac{a_1(1 - r^n)}{1 - r}

where:

  • SnS_n is the sum of the first nn terms,
  • a1a_1 is the first term,
  • Given values a1 = -2 r = -3 n = 10

Calculate the sum of the first 10 terms using the formula

S_n = a1 * (1 - r**n) / (1 - r) S_nThe sum of the first 10 terms of the geometric progression is 29,524.

Would you like more details or have any further questions on this topic?

Here are 5 related questions to explore further:

  1. How does the sum of a geometric progression change if the common ratio is positive?
  2. What happens to the sum if the common ratio is between -1 and 1?
  3. Can the sum of an infinite geometric progression ever be finite? If so, under what conditions?
  4. How do you derive the formula for the sum of a geometric progression?
  5. How can the sum of a geometric series be calculated if the common ratio is a fraction?

Tip: In geometric progressions, the sign of the common ratio significantly affects

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Math Problem Analysis

Mathematical Concepts

Geometric Progression
Series and Sequences

Formulas

Sum of the first n terms of a GP: S_n = a_1 * (1 - r^n) / (1 - r)

Theorems

Formula for the sum of a geometric progression

Suitable Grade Level

Grades 9-12