Unit 7, Activity 3, Series and Partial Sums with Answers Blackline Masters, Advanced Math – Pre-Calculus Page 227 Louisiana Comprehensive Curriculum, Revised 2008 1. Write the formula for tn, the nth term of the sequence, then find the sum of each of the following using the algebraic formula. Verify your answers with the calculator. a) The first 10 terms of 11319127−+− +...The formula is tnn=−FHGIKJ−131. The sum is -1.4999… b) 123104444++++The formula is tnn=4. The sum is 25,333.c) 2 + 6 + 10 +14 +……+ 30 The formula is n=−42. The sum is 128. 2.The chain letter reads: Dear Friend, Copy this letter 6 times and send it to 6 of your friends. In twenty days you will have good luck. If you break this chain you will have bad luck! Assume that every person who receives the letter sends it on and does not break the chain. a) Fill in the table below to show the number of letters sent in each mailing: 1stmailing 2ndmailing 3rdmailing 4thmailing …10thmailing 6 626364610b) After the 10thmailing, how many letters have been sent?
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