SOLUTION: Use the method of undetermined coef cients to nd the sum of 1 +2+3+···+(n−1)+n,n∈N
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Question 1120395: Use the method of undetermined coef cients to nd the sum of 1 +2+3+···+(n−1)+n,n∈N
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
.
See the lesson
- Mathematical induction and arithmetic progressions
in this site, where the formula was proved by the method of Mathematical induction.
See the lesson
- The proofs of the formulas for arithmetic progressions
in this site, where the formula was proved in the context of arithmetic progressions.
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