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Grade: 12th pass

                        

A train time table must be compiled for various days of the week so that two trains twice a day depart for three days,one train daily for two days and three trains once a day for two days.How many different time tables can be compiled? A 140 B 210 C 133 D 72

2 years ago

Answers : (1)

Arun
24742 Points
							
Dear student
 
 
the no of trains a day (the digits 1,2,3)are three groups of like elements from which a sample must be formed.
In the time-table for a week, the number 1 repeats twice, the number 2  repeats thrice, and the number 3repeated twice.
The number of different time-tables is given by :7!/ 2!3!2!=210
2 years ago
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