Homework Answers
Solution: Given that there are 7 speakers who are selected to give spech on how they spent their summer vacation.
Now
the 7 people can be arrange on these 7 places.
_ _ _ _ _ _ _
lets assume that on the 1st place there is one speaker out of those 7
7 _ _ _ _ _ _
Now there are remaining 6 places where we have to choose a person. but now we have only 6 people who can be selected on that place.
7 * 6 _ _ _ _ _
In this way,
Now the 7 places can be arranged as,
7*6*5*4*3*2*1 = 7!
Thus the total number of ways speakers can be arranged is in 7! ways
i.e 7! = 5040 ways
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