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What kind of sequence is this?\newline61,74,87,100,61, 74, 87, 100, \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?\newline61,74,87,100,61, 74, 87, 100, \dots\newlineChoices:\newline(A) arithmetic\newline(B) geometric\newline(C) both\newline(D) neither
  1. Verify Consecutive Differences: Let's verify if the differences between consecutive terms are uniform. Given sequence: 61,74,87,100,ext...61, 74, 87, 100, ext{...} Are the consecutive differences in the sequence equal? Let's calculate the differences: 7461=1374 - 61 = 13, 8774=1387 - 74 = 13, 10087=13100 - 87 = 13. The 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. In this case, the common difference is 1313.
  3. Check for Geometric Sequence: To confirm that this is not a geometric sequence, we need to check if there is a common ratio between consecutive terms. Let's calculate the ratios: 74611.2131\frac{74}{61} \approx 1.2131, 87741.1757\frac{87}{74} \approx 1.1757, 100871.1494\frac{100}{87} \approx 1.1494. The ratios between consecutive terms are not equal, so this is not a geometric sequence.
  4. Final Conclusion: Since we have established that the sequence has a common difference and does not have a common ratio, we can conclude that the sequence is an arithmetic sequence and not a geometric sequence. Therefore, the correct choice is (A)(A) arithmetic.

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