Deal Maker’s 3-Day Tally: $37 Billion
Apollo Group founder Leon Black has struck about $37 billion worth of deals in last three days; Apollo acquired real estate franchiser Realogy on Dec 17 for $9 billion; Apollo acquires Harrah's Entertainment, world's largest casino company, for $27.8 billion; deal, which includes assumption of $10.7 billion in debt, is made in tandem with Texas Pacific Group; graph; photo (M)