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Which of the following form an AP? Justify your answer.
$ \frac{1}{2}, \frac{1}{3}, \frac{1}{4}, \ldots $
Given:
Given sequence is \( \frac{1}{2}, \frac{1}{3}, \frac{1}{4}, \ldots \)
To do:
We have to check whether the given sequence is an AP.
Solution:
In the given sequence,
$a_1=\frac{1}{2}, a_2=\frac{1}{3}, a_3=\frac{1}{4}$
$a_2-a_1=\frac{1}{3}-\frac{1}{2}=\frac{2-3}{6}=\frac{-1}{6}$
$a_3-a_2=\frac{1}{4}-\frac{1}{3}=\frac{3-4}{12}=\frac{-1}{12}$
Here,
$a_2 - a_1 ≠ a_3 - a_2$
Therefore, the given sequence is not an AP.
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