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- Rajiv Jain made a big bet on Gautam Adani's business empire last month.
- He told Bloomberg Monday that he believes his $1.9 billion investment could deliver 100% returns over the next five years.
- Adani Group has suffered a stock-market rout after short-seller Hindenburg released a bombshell report.
Investing in Gautam Adani's companies could generate massive returns over the next five years, according to an emerging markets specialist who made a big bet on the Indian tycoon's troubled business empire last month.