alleryWhich of the following lists is an arithmetic progression?
A$8000, 10000, 12500, 15625, \ldots$
B$1, 1, 2, 3, 5, 8, \ldots$
C$45, 43, 41, 39, 37, \ldots$
D$1, 4, 9, 16, 25, \ldots$
Answer & Solution
Correct answer: C. $45, 43, 41, 39, 37, \ldots$
An arithmetic progression has a fixed common difference between consecutive terms.
In option C, each term decreases by 2, so the common difference is $-2$.
In the other options, the pattern is not formed by adding the same number each time.
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