Question

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 ......​

Answer 1

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

Answer 2

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

Mark as brainliest.........