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UGC NET CSE | September 2013 | Part 2 | Question: 19

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Answer B

Total number of ways 12 offices can be painted = 12!

But 3 of them will be green, 2 of them pink, 2 of them yellow and 5 of them  white.

Answer = 12! /(3!* 2 ! * 2! * 5!) = 166320
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