I don't know (I don't count them) but certainly fewer than in the past. I always used to give one to everyone at work, and one to everyone in all our Morris sides. It got a bit meaningless - not to mention wasteful of paper. Last year, a lot of us got together and decided by mutual consent not to give cards to each other, but to give to charity instead.
I guessed about 30, but I'm not quite sure. Last year LJ meant I got to send some cards to interesting places - must remember to make Christmas card post.
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(Mind you, it seems topical. I have been teaching analysis of variance this week.)
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