17-26 ■ Arithmetic Sequence? The first four terms of a sequence are given. Can these terms be the terms of an arithmetic sequence? If so, find the common difference.
Whether the sequence is arithmetic sequence and the common difference when it is arithmetic sequence.
An arithmetic sequence is a sequence of the form,
Here, is the first term and is the difference between two consecutive terms.
The sequence is given as,
Since in the arithmetic sequence, any two consecutive terms of the sequence differ by d. then,
Calculate the common difference between second and first terms.
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