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The numbers of pairs of rabbits shown in the figure are $1, 1, 2, 3, 5, 8, \ldots$. Why is this pattern not an arithmetic progression? 
ABecause the terms are increasing
BBecause the common difference changes from term to term
CBecause the first two terms are equal
DBecause it has only whole numbers
Answer & Solution
Correct answer: B. Because the common difference changes from term to term
An arithmetic progression must have the same difference between consecutive terms. In $1,1,2,3,5,8,\ldots$, the differences are $0,1,1,2,3,\ldots$, which are not constant. So the rabbit pattern is not an AP.
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