What's the source of wealth of the person worth $17 billion?
CREATE TABLE table_name_10 (source VARCHAR, net_worth_us$__billions_ VARCHAR)
SELECT source FROM table_name_10 WHERE net_worth_us$__billions_ = 17
### Context: CREATE TABLE table_name_10 (source VARCHAR, net_worth_us$__billions_ VARCHAR) ### Question: What's the source of wealth of the person worth $17 billion? ### Answer: SELECT source FROM table_name_10 WHERE net_worth_us$__billions_ = 17