Average rate on 30-year mortgage falls to 3.66 pct.

WASHINGTON (AP) — Average long-term U.S. mortgage rates fell for the third straight week, with the benchmark 30-year rate again marking its lowest level since May 2013. The average for a 15-year mortgage, a popular choice for people who are refinancing, dipped below 3 percent for the first time since then.

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Average rate on 30-year mortgage falls to 3.66 pct.