
Concept explainers
Determine whether the sequence −223; − 689; − 20827; −63281 is arithmetic, geometric, or neither.

Answer to Problem 80STP
The sequence is neither.
Explanation of Solution
Given:
The sequence:−223; − 689; − 20827; −63281
Concept Used:
A sequence is a set of numbers, called terms, arranged in some particular order.
An arithmetic sequence is a sequence with the difference between two consecutive terms constant. The difference is called the common difference.
A geometric sequence is a sequence with the ratio between two consecutive terms constant.
Calculation:
First Term: a1=1
Common Difference for Arithmetic sequence:
d=2nd term−1st term = −689−(−222)=−29 or d=3rd term−2nd term = −20827−(−689)=−427
The common differences are not constant, so the sequence is not arithmetic.
Common Ratio for Geometric sequence: r = 2nd term1st term= −689−223 =3433 or r = 3rd term2nd term= −20827−689 =5251
The common ratios are not constant, so the sequence is not geometric.
Thus, the sequence is neither.
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