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Find the sum of a geometric series for which a1 = 6, an = 96, and r = 2

1 Answer

3 votes

Answer:

  • 186

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Use the sum of the first n terms formula:

  • S = a₁ * (1 - rⁿ) / (1 - r) where a₁ is the first term, r is the common ratio, and n is the number of terms.

We are given:

  • a₁ = 6,
  • r = 2,
  • aₙ = 96.

First, let's find n using the nth term formula:

  • aₙ = a₁ * rⁿ⁻¹
  • 96 = 6 * 2ⁿ⁻¹
  • 16 = 2ⁿ⁻¹
  • 2⁴ = 2ⁿ⁻¹
  • n - 1 = 4
  • n = 5

Now, we can find the sum using the formula:

  • S = 6 * (1 - 2⁵) / (1 - 2)
  • S = 6 * (1 - 32) / (-1)
  • S = 6 * 31
  • S = 186

The sum of the geometric series is 186.

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User Kyranjamie
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