A train time table must be compiled for various days of a week so that 2 trains twice a day depart for 3 days ,one train daily for 2 days and 3 trains once a day for 2 days .How many different time tables can be compiled....? plz answer seriously daina ......
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Answered by
4
Answer:
The number 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 is repeated twice, the number 2 is repeated thrice, and the number 3 is repeated twice.
The number of different time-tables is given by
(2,3,3)=
2!3!2!
7! =210
Answered by
10
Answer:
For train 1 number of ways you can choose 3 days from 7 days =
For train 2 number of ways you can choose 2 days from rematning 4 =
For train 3 number of ways you can choose 2 days from remaining 2 days=
Total ways =
=210
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