Finding the common difference in an arithmetic progression

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Michael_Light
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Homework Statement



Need help with number (9)..
DSC00560.jpg


Homework Equations





The Attempt at a Solution



Can anyone give me some hints? Thanks.
 

Discussion

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Sn=3n2 + 4n
Hint:
S1=3+4=7
S2=12+8=20
 

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