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December 22, 2014

December 22, 2014

Posted by **Anonymous** on Sunday, February 21, 2010 at 8:04am.

- maths -
**Reiny**, Sunday, February 21, 2010 at 8:35am"the first three terms form an arithmetric progression"

so....

2y+2 - (x+4y) = x - (2y+2)

which gives x = 2

"the last three tern form a geometric sequence"

so ...

x/(2y+2) = (y-1)/x , but we know x = 2

2/(2y+2) = (y-1)/2

I get y = ±√3

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