Did chapter 45 of Donald Trump's book "Art of the Deal" state "Never admit defeat. You win. If you don't win claim they cheated"? No, that's not true: The book only has 14 chapters and this quote is not included in the book. The number 45 may be significant in that Trump is the 45th president.
The claim appeared in a Facebook post (archived here) where it was published on November 18, 2020. The fake quote read:
Never admit defeat. You win. If you don't win claim they cheated. They rigged it. They stole it. You are the aggrieved but you are the true winner always. Threaten to sue and/or die. No one will remember the outcome. Just that you fought to defend your honor. This is essential to keep your brand healthy and keep the millions of chumps and losers, your base.
This is what the post looked like on Facebook at the time of writing:
(Source: Facebook screenshot taken on Fri Nov 20 14:39:19 2020 UTC)
The following are photos of a physical copy of the book, proving that the book does not have 45 chapters, but 14:
What's more, the quote did not appear in a search of the e-book version:
Fact checking websites Snopes and Check Your Fact reached the same conclusion.