Re: jnu 2010

Posted by Bankelal on May 13, 2014; 6:23pm
URL: http://discussion-forum.276.s1.nabble.com/jnu-2010-tp7589613p7589623.html

Hi Manisha,

Sample space= n^n

f: A->A can be one-to-one

when for f(1) we have 1..n .ie n choices

for f(2)  n-1 choices...

...

f(n). 1 choice 

No. of one-one mappings possible= n(n-1)...1

ie. ans is n!/(n^n) Rahul(p....u)

On Tue, May 13, 2014 at 11:28 PM, manisha sachdeva [via Discussion forum] <[hidden email]> wrote:

ques 36)in an examination there are three multiple choice questions and each question has 4 choices.
number of ways in which a student can fail to get all the answers correct?

ques 37) a function is selected at random from all the functions of the set A= (1,2,3,...N) in to self.
the probability that the function selected is one to one is?

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