Problem of arithmetic progression :-
Level
pending
In the A.P. S(n)-2S(n-1)+S(n-2)= _ _ _ {n>2}
a
d
2d
a+d
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1 solution
S n - S (n-1) - S (n-1) + S (n-2)
S n - S (n-1) - {S (n-1) - S (n-2)}
t n - t (n-1)
This will give the common difference of the arithmetic sequence.