Respuesta :
The conclusion is invalid because the fact that the slaves sing doesn't mean that they're happy.
From the story, the slaves were brainwashed by their masters and also made to do difficult jobs. They were also uneducated.
Sometimes, the slaves sang when they were working. This made their masters believe that they were happy. This wasn't true because singing, in this case, doesn't imply happiness. Therefore, their conclusion is invalid.
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