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The first four terms in an arithmetic sequence are x + y, x - y, x + 3y, and 1, in that order. What is the fifth term?

 Mar 16, 2021
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I don't believe  the  series is correct  as written

 

The  common difference  between  the   first two terms =  -2y

But...the common difference  between second and third terms  = 4y

 

cool cool cool

 Mar 16, 2021

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