Please explain why! I want to understand and learn! 15. What is NOT the reason why,r doubling strategy in a fair game does not guarantee free money

Please help need answer ASAP in 40 minutes show complete and clear work thank you.

Please explain why! I want to understand andlearn! 15. What is NOT the reason why,r doubling strategy in a fair game does not guarantee free moneyin the real world? Yen have 0an finite wealth er credit. 1)2) The heuse will not accept arbitrarily large bet size.3) Deeb‘s Ihenrern does not weak in this case. 4) 5) The expected prefit from doubling strategyr is still zero by Deeh‘s theeretn.Year wealth is a martingale in this case.