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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).

7,14,21,dots

(1)/(2)

-7
7
2

For the following sequence determine the common difference (if it is an arithmetic sequence) or the common ratio (if it is a geometric sequence).\newline7,14,21, 7,14,21, \ldots \newline12 \frac{1}{2} \newline7 -7 \newline77\newline22

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).\newline7,14,21, 7,14,21, \ldots \newline12 \frac{1}{2} \newline7 -7 \newline77\newline22
  1. Identify Sequence Type: To determine whether the sequence is arithmetic or geometric, we need to look at the pattern of the numbers. In an arithmetic sequence, the difference between consecutive terms is constant. In a geometric sequence, the ratio between consecutive terms is constant.
  2. Calculate Difference: 11st & 22nd Terms: Let's check the difference between the first two terms: 147=714 - 7 = 7.
  3. Calculate Difference: 22nd & 33rd Terms: Now, let's check the difference between the second and third terms: 2114=721 - 14 = 7.
  4. Confirm Arithmetic Sequence: Since the difference between consecutive terms is constant, we can conclude that the sequence is an arithmetic sequence with a common difference of 77.
  5. Check Other Options: We can also check the other options to ensure that they are not the common difference. The sequence does not decrease by 77, so 7-7 is not the common difference. The sequence does not increase by 22, so 22 is not the common difference. The sequence does not increase by half, so (1)/(2)(1)/(2) is not the common difference.

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