Question
Define an arithmetic progression.
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Answer
A sequence $a_1, a_2, a_3, \ldots . .$, an is called an arithmetic progression of then exists a constant $d$
Such that $a_2-a_1=d, a_3-a_2=d, \ldots . . a_n-a_{n-1}=d$
and so on and d is called common difference.
Such that $a_2-a_1=d, a_3-a_2=d, \ldots . . a_n-a_{n-1}=d$
and so on and d is called common difference.
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