a + ar = x
ar^(n-2) + ar^(n-1) = y
a(1+r) = x
ar^(n-2) (1+r) = y
xr^(n-2) = y
r^(n-2) = y/x
r = (y/x)^(1/(n-2))
The sum of the first two term of a g.p is x and the sum is of the last two terms is y. If there are n terms in all. Find the common ratio
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