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Number of permutations of five letters

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Reference no: EM132186118

True or False for the following:

a) The number of permutations of five letters A,B,C,D, and E with A comes before C, and C comes before E is 20. 

b) The number of permutations of six letters A, B, C, D, E and F that contains "BAD" is 24. 

c)  The number of permutations of six letters A, B, C, D, E and F with A comes before B and C comes before D is 180. 

d) A, B, C, D , E and F sit at a round table. The chance that A and B sit next to each other is 40%. 

Reference no: EM132186118

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