World's richest billionaires

POSTED: 07:56 AM PST Mar 08, 2012    UPDATED: 07:32 AM PST Mar 04, 2013 

A Mexican billionaire tops Forbes' world's richest list for a fourth year in a row.

Sheldon Adelson
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15. Sheldon Adelson -- An American casino and hotel magnate, Adelson is Chairman and Chief Executive Officer of the Las Vegas Sands Corporation. He is worth an estimated $26.5 billion.

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