<P> In mathematics, an arithmetic progression (AP) or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant . For instance, the sequence 5, 7, 9, 11, 13, 15,...is an arithmetic progression with common difference of 2 . </P> <P> If the initial term of an arithmetic progression is a 1 (\ displaystyle a_ (1)) and the common difference of successive members is d, then the nth term of the sequence (a n (\ displaystyle a_ (n))) is given by: </P>

What is the common difference of an ap
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