Question

The following duties need to be carried out: clean the board, arrange

the tables, sweep the floor and clear the waste paper basket. Find the
number of ways of assigning these duties to 4 students, given that each
student will perform only one duty?
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Answer 1

Explanation:

every single person will do 1/4 of each job.

divide into 2 group and each person will do half of one job and half of another.