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What kind of sequence is this?\newline89,178,356,712,89, 178, 356, 712, \dots \newlineChoices:\newline(A) arithmetic\newline(B) geometric\newline(C) both\newline(D) neither

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Q. What kind of sequence is this?\newline89,178,356,712,89, 178, 356, 712, \dots \newlineChoices:\newline(A) arithmetic\newline(B) geometric\newline(C) both\newline(D) neither
  1. Check Arithmetic Differences: Let's first check if the sequence is arithmetic by finding the differences between consecutive terms. Given sequence: 89,178,356,712,89, 178, 356, 712, \ldots\newlineCalculate the differences: 17889,356178,712356178 - 89, 356 - 178, 712 - 356.
  2. Calculate Differences: Perform the calculations: 17889=89178 - 89 = 89, 356178=178356 - 178 = 178, 712356=356712 - 356 = 356.\newlineCheck if the differences are equal: 8989, 178178, 356356.\newlineThe differences are not equal, so the sequence is not arithmetic.
  3. Check Equal Differences: Now, let's check if the sequence is geometric by finding the ratios between consecutive terms. Given sequence: 89,178,356,712,89, 178, 356, 712, \ldots\newlineCalculate the ratios: 17889,356178,712356.\frac{178}{89}, \frac{356}{178}, \frac{712}{356}.
  4. Check Geometric Ratios: Perform the calculations: 17889=2\frac{178}{89} = 2, 356178=2\frac{356}{178} = 2, 712356=2\frac{712}{356} = 2.\newlineCheck if the ratios are equal: 22, 22, 22.\newlineThe ratios are equal, so the sequence is geometric.
  5. Calculate Ratios: Since the sequence is not arithmetic but has a common ratio, it is a geometric sequence.

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