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Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.

Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.

On the Next Episode of The Lead

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March 24th, 2014
05:20 PM ET

How do authorities know where Flight 370 ended? Math was key

(CNN) – Hope has run out in the search for survivors of Malaysia Airlines Flight 370, but the devastating news Monday at least offers a new level of certainty about where to look for the aircraft.

Malaysia Airlines Flight 370 went down in the southern Indian Ocean, Malaysian Prime Minister Najib Razak said Monday, citing a new analysis of satellite data by a British satellite company and accident investigators, and what he called "a type of analysis never before used in an investigation."

CNN's Tom Foreman walks us through the data, and the conclusion it points to.

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