Line 5 is written incorrectly, but as line 6 is correct I suspect it's just a typo. Both your and Soroban's derivations are correct, you simply used a slightly different method.

-Dan

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- Sep 15th 2006, 05:07 AMtopsquark
- Sep 15th 2006, 05:13 AMchancey
- Sep 15th 2006, 10:36 AMrpatel
thank you everyone