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Find the number of different 4-letter words with or without

meanings, that can be formed from the letters of the word ‘NUMBER’


NUMBER have 6 different letters ,4 letters we can chose in 6c4 way
4 letters can be arranged 4! way 
no. of words = 4!*6c4
                  = (4!*6!)/(2!*4!)
                  =  360. 
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Word number has 6 letters in 4 places can be arranged in 6p4 ways=6!/6- 4!=6!/2=720/2=360
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