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The list $-1.0, -1.5, -2.0, -2.5, \ldots$ is an AP. What is its common difference?

A$0.5$
B$-0.5$
C$-1.0$
D$1.5$
Answer & Solution
Correct answer: B. $-0.5$
The common difference is found by subtracting a term from the next term: $-1.5-(-1.0)=-0.5$. Since the same difference continues, the common difference is $-0.5$.
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