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What kind of sequence is this?\newline115,95,75,55,115, 95, 75, 55, \dots\newlineChoices:\newline(A) arithmetic\newline(B) geometric\newline(C) both\newline(D) neither\newline

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Q. What kind of sequence is this?\newline115,95,75,55,115, 95, 75, 55, \dots\newlineChoices:\newline(A) arithmetic\newline(B) geometric\newline(C) both\newline(D) neither\newline
  1. Verify Consecutive Differences: Let's verify if the differences between consecutive terms are uniform. Given sequence: 115,95,75,55,115, 95, 75, 55, \ldots\newlineAre the consecutive differences in the sequence equal? \newline95115=2095 - 115 = -20, \newline7595=2075 - 95 = -20, \newline5575=2055 - 75 = -20. \newlineThe consecutive differences in the sequence are equal.
  2. Identify Arithmetic Sequence: Since the consecutive differences are equal, this indicates that the sequence is an arithmetic sequence. An arithmetic sequence is defined by having a common difference between consecutive terms.
  3. Check for Geometric Sequence: Now, let's check if the sequence could also be geometric by finding the ratios between consecutive terms. 95115\frac{95}{115} does not equal 7595\frac{75}{95}, nor does it equal 5575\frac{55}{75}. The ratios are not consistent, so the sequence is not geometric.
  4. Final Conclusion: Based on the previous steps, we can conclude that the sequence is arithmetic because it has a common difference, but it is not geometric because it does not have a common ratio.

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