Question: Using the properties of summations defined in Appendix A, prove that the following equation from the top of page 27 is true. 20-1) = n(n+1)

Using the properties of summations defined in Appendix A, prove that

Using the properties of summations defined in Appendix A, prove that the following equation from the top of page 27 is true. 20-1) = n(n+1)

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