For instance
7,11,14,18
There is a difference of four between each term
We can find the An term of a sequence in the equation
An=A1+(n-1)d
D is the common difference
Sn=n/2(A1+An)
This is the sum of a finite sequence
Say we were given the sequence
1,3,5,7
Sn=(4/2)(1+7) = 16
thank you for sharing. as we can see, arithmetic sequences always have a common difference. which will be a(n)-a(n-1)
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