Need the sum of a sequence? huh?

lexiuncc

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Joined
Jul 23, 2007
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4
Find the sum for the following sequence, using the formula for Sn:
4, 12, 36, 108, 324
 
This is possibly an example of a geometric sequence. Notice how each value is a factor of three greater than its predecessor. Have you the formula? Plug it in.
 
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