Nov 2 (Reuters) - The euro fell to a three-week low against the dollar on Friday, pushing the dollar index to a seven-week high, with traders citing option related selling of the euro by macro investors.
The euro fell to $1.2865, down 0.6 percent on the day to hit its lowest level since Oct. 11. Traders said macro funds sold the euro to take out a $1.2880 to $1.3040 "double no touch" options barrier.
The dollar index rose to 80.389, its highest level since Sept. 11.
