
#1
Mar211, 10:52 PM

P: 117

1. The problem statement, all variables and given/known data
Need help with number (9).. 2. Relevant equations 3. The attempt at a solution Can anyone give me some hints? Thanks. 



#3
Mar1911, 11:56 PM

P: 44

S_{n}=3n^{2} + 4n
Hint: S_{1}=3+4=7 S_{2}=12+8=20 


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