Dinner Hand Shakes Puzzle-Asked in interviews.

Question:

A couple invites n - 1 other couples to dinner.
Once everyone arrives, each person shakes hands with everyone he doesn’t know.
Then, the host asks everyone how many hands they shook, and each person replies with a different number. Assuming that everyone knows his or her own spouse, how many hands did the hostess shake?

Solution: n-1

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