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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Jan 2008 18:00:41 IST
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simple hai yaar,
Let p = a;
q = az;
r = az2
s = az3
Now,
p2 - q2 = (p + q)(p - q)
= (a + az)(a - az)
= a(1 - z2)
q2 - r2 = (q + r)(q - r)
= (az + az2)(az - az2)
= az(1 - z2)
Hope u get d point.
Here the common ratio is z.
And the first term is a(1 - z2).
This proves the required condition.
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