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Z3/Answers (view source)

37 bytes added , 12:06, 16 August 2016

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Each group have 5 letter that can for 5! words = 120

So total number of words = 210*120 = 25200 words

+

(COMBIN(7,3)*COMBIN(4,2))*5! = 25200

writer

5,435

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