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What is the value of y in the arithmetic sequence y + 6, 12, y?

 Jun 20, 2020
 #1
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Since this is arithmetic, the middle term will be the average of the outside two:

       12  =  [ (y + 6) + (y) ] / 2

 

Solve ...

 Jun 20, 2020
 #2
avatar+794 
-1

Thank you! I found that y = 9, which is correct!

AnimalMaster  Jun 20, 2020

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