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,…21−772
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).7,14,21,…21−772
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.
Calculate Difference: 1st & 2nd Terms: Let's check the difference between the first two terms: 14−7=7.
Calculate Difference: 2nd & 3rd Terms: Now, let's check the difference between the second and third terms: 21−14=7.
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 7.
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 7, so −7 is not the common difference. The sequence does not increase by 2, so 2 is not the common difference. The sequence does not increase by half, so (1)/(2) is not the common difference.
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