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If the 6th6^{th} and 7th7^{th} term of a geometric sequence are 55 and 10-10 respectively, what is the 10th10^{th} term?

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Q. If the 6th6^{th} and 7th7^{th} term of a geometric sequence are 55 and 10-10 respectively, what is the 10th10^{th} term?
  1. Identify common ratio: Identify the common ratio rr using the 66th and 77th terms.\newlineCalculation: 10/5=2-10 / 5 = -2\newlineCommon ratio, r=2r = -2
  2. Calculate 88th term: Calculate the 88th term using the 77th term and the common ratio.\newlineCalculation: 10×2=20-10 \times -2 = 20\newline88th term = 2020
  3. Calculate 99th term: Calculate the 99th term using the 88th term and the common ratio.\newlineCalculation: 20×2=4020 \times -2 = -40\newline99th term = 40-40
  4. Calculate 1010th term: Calculate the 1010th term using the 99th term and the common ratio.\newlineCalculation: 40×2=80-40 \times -2 = 80\newline1010th term = 8080

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