Arithmetic Sequence problem?
A) Find the sum of the natural numbers from 1 to 100 inclusive.
B) Find the sum of the natural numbers from 101 to 200 inclusive.
C) Find and simplify the expression for the sum of the natural numbers from n+1 to 2n inclusive
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C) ((n+1)+2n)(n-1)/2 = (3n+1)(n-1)/2