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In the sequence 6, x, y, 16, the first three terms form an arithmetic sequence, and the last three terms form a geometric sequence.  Find x and y.

 Dec 8, 2019
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6  9  12  16    looks like    

 

arithmetic sequence   d = 3

geometricsequence   r = 1 1/3

 

x=9 y=12

 Dec 8, 2019

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