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(a)
To argue that numbers of ways of placing the balls in bins is
(a)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given information:
The n balls are distinct and their order within bin doesn’t matter.
Explanation:
There can be b different decisions made for n balls about their placement. The total number of possibilities is just
(b)
To prove that there are exactly
(b)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given information:
It is assumed that balls are distinct and that balls in each bin are ordered.
Explanation:
First assume that sticks can be distinguished. This implies that there are total of n balls and
This arrangement can be related with the original statement, where sticks can be imagined as dividing lines between bins and ordered balls between them can be imagined as ordered balls in each bin.
(c)
To show that
(c)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given information:
The balls are identical and their order within a bin does not matter.
Explanation:
Using results from above two parts, it can be noticed that any of the n permutation of balls will result in the similar configuration. Thus, count from the previous parts must be divided by
(d)
To show that number of ways of placing the balls is
(d)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given information:
The balls are identical and no bin may contain more than one ball.
Explanation:
Here, a set of bins to contain balls is selected,as each bin can have a ball or not. The numbers of bins selected is n since number of non-empty bins and the numbers of balls must be equal. In other words, a subset of size n of the bins is being selected from the whole set of bins. This becomes the combinatorial definition of
(e)
To show that number of ways of placing the balls is
(e)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given information:
The balls are identical and no bin may be left empty.
Explanation:
The condition is to put one ball in each bin as no bin can be left empty. Thus there are
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Chapter C Solutions
Introduction to Algorithms
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