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Question 28 and 29, Exercise 4.4
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and so on. In order to inform the entire staff, 6 rounds of calls are made. Counting the principal, find ... rst person $=a_1= 1$ principal \\ People in first round $= a_2 = 2$ \\ People in 2nd round $= a_3 = 2(2)=4$ \\ ... \\ People in 6ht round $= a_7$.\\ Thus we have the series $$ 1+2+4+...+a_7 $$ We