3 same day birthdays in a work department of 11

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I work in the Business Tax department of the Guildford office of a national accountancy firm. The office is about 120 strong and the business tax department numbers 11. Three of us in the business tax department have the same birthday, with ages varying between 30 and 59.
Total votes: 280
Date submitted:Sun, 15 Jan 2012 12:58:53 +0000Coincidence ID:4556