I've just found this in a book: "Welche möchte Sie lieber?", and "Möchte Sie" is repeated a couple of lines later, so it's unlikely to be a typo.

Is this correct? I would have expected "Möchten Sie".

I've found these sentences in a book:

"Möchte Sie Banknoten mit Bildern von Kaninchen?" 

and a couple of lines later:

"Welche möchte Sie lieber - mit Bildern von Kaninchen oder von Hunden?"

Is this correct? I would have expected "Möchten Sie".

The sentences are part of a conversation, so it's definitely meant to be 'Sie' rather than 'sie'. Also, the book is "A Second German Reader" by Elisabeth May (Kindle edition, 2012), so it's supposed to be teaching me modern German.