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For the following sequence determine the common difference (if it is an arithmetic sequence) or the common ratio (if it is a geometric sequence).

12,quad8sqrt3,quad16,dots

2sqrt3

(sqrt3)/(3)

sqrt3

(2sqrt3)/(3)

For the following sequence determine the common difference (if it is an arithmetic sequence) or the common ratio (if it is a geometric sequence).\newline12,83,16, 12, \quad 8 \sqrt{3}, \quad 16, \ldots \newline23 2 \sqrt{3} \newline33 \frac{\sqrt{3}}{3} \newline3 \sqrt{3} \newline233 \frac{2 \sqrt{3}}{3}

Full solution

Q. For the following sequence determine the common difference (if it is an arithmetic sequence) or the common ratio (if it is a geometric sequence).\newline12,83,16, 12, \quad 8 \sqrt{3}, \quad 16, \ldots \newline23 2 \sqrt{3} \newline33 \frac{\sqrt{3}}{3} \newline3 \sqrt{3} \newline233 \frac{2 \sqrt{3}}{3}
  1. Check for Difference: To determine whether the sequence is arithmetic or geometric, we need to check if there is a constant difference (arithmetic sequence) or a constant ratio (geometric sequence) between consecutive terms.
  2. Subtract First and Second Term: First, let's check for a common difference by subtracting the second term from the first term: 83128\sqrt{3} - 12.
  3. Subtract Third and Second Term: Perform the subtraction: 8312=8(1.732)1213.85612=1.8568\sqrt{3} - 12 = 8(1.732) - 12 \approx 13.856 - 12 = 1.856. This is not an integer, and we should check the next pair of terms to see if there is a consistent difference.
  4. Check for Ratio: Now, subtract the third term from the second term: 1683.16 - 8\sqrt{3}.
  5. Divide Second by First Term: Perform the subtraction: 1683=168(1.732)1613.856=2.14416 - 8\sqrt{3} = 16 - 8(1.732) \approx 16 - 13.856 = 2.144. This difference is not the same as the previous one, indicating that the sequence is not arithmetic.
  6. Divide Third by Second Term: Since the sequence is not arithmetic, let's check for a common ratio by dividing the second term by the first term: (83)/12(8\sqrt{3}) / 12.
  7. Confirm Geometric Sequence: Perform the division: (83)/12=(812)3=(23)3(8\sqrt{3}) / 12 = (\frac{8}{12})\sqrt{3} = (\frac{2}{3})\sqrt{3}. This simplifies to (23)/3(2\sqrt{3}) / 3.
  8. Confirm Geometric Sequence: Perform the division: 8312=8123=233\frac{8\sqrt{3}}{12} = \frac{8}{12}\sqrt{3} = \frac{2}{3}\sqrt{3}. This simplifies to 233\frac{2\sqrt{3}}{3}.Now, divide the third term by the second term to check if the ratio is consistent: 1683\frac{16}{8\sqrt{3}}.
  9. Confirm Geometric Sequence: Perform the division: (83)/12=(8/12)3=(2/3)3(8\sqrt{3}) / 12 = (8/12)\sqrt{3} = (2/3)\sqrt{3}. This simplifies to (23)/3(2\sqrt{3}) / 3.Now, divide the third term by the second term to check if the ratio is consistent: 16/(83)16 / (8\sqrt{3}).Perform the division: 16/(83)=(16/8)/3=2/316 / (8\sqrt{3}) = (16/8) / \sqrt{3} = 2 / \sqrt{3}. To rationalize the denominator, multiply the numerator and denominator by 3\sqrt{3} to get (23)/3(2\sqrt{3}) / 3.
  10. Confirm Geometric Sequence: Perform the division: (83)/12=(8/12)3=(2/3)3(8\sqrt{3}) / 12 = (8/12)\sqrt{3} = (2/3)\sqrt{3}. This simplifies to (23)/3(2\sqrt{3}) / 3.Now, divide the third term by the second term to check if the ratio is consistent: 16/(83)16 / (8\sqrt{3}).Perform the division: 16/(83)=(16/8)/3=2/316 / (8\sqrt{3}) = (16/8) / \sqrt{3} = 2 / \sqrt{3}. To rationalize the denominator, multiply the numerator and denominator by 3\sqrt{3} to get (23)/3(2\sqrt{3}) / 3.The ratio between the second and first term is (23)/3(2\sqrt{3}) / 3, and the ratio between the third and second term is also (23)/3(2\sqrt{3}) / 3. This indicates that the sequence is geometric with a common ratio of (23)/3(2\sqrt{3}) / 3.

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