The formula1+2+3++n =n(n+1) 2 is true for all integers n
Chapter 5, Problem 5.254(choose chapter or problem)
The formula1+2+3++n =n(n+1) 2 is true for all integers n 1. Use this fact to solve each of the following problems: a. If k is an integer and k 2, nd a formula for the expression 1+2+3++(k1).b. If n is an integer and n 1, nd a formula for the expression 3+2+4+6+8++2n.c. If n is an integer and n 1, nd a formula for the expression 3+32+33++3n+n.
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