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An arithmetic progression (AP) is a list of numbers in which each term is obtained by adding a fixed number d to the preceding term,expect the first term.the fixed number d is called the common difference.
as u asked the formulas-
there are 3 formulas:-

hope this helps u....
0 0 0
ur welcome
but i need whole explanation of it
means do u want any example??
no no i need formulas of a.p
k i will edit my answer
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