Math Is Fun Forum

smiyc86

Member

Registered: 2009-03-19

Posts: 78

Probability

I know the formula for this but i need a proof of how to arrive at this formula ... can neone help me ...

There are 'n' no. of balls marked 1 to n .... and 'n' no. of boxes marked 1 to n ..... each box can hold only one ball and every ball should go into a box ....

what is the no. of ways in which we can place the balls in the boxes such that no ball goes into its same numbered box...

the answer is

n! ( 1/2! - 1/3! + 1/4! ... 1/n!)

Post the solution

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I love Maths and Music ... dunno which more

smiyc86

Member

Registered: 2009-03-19

Posts: 78

Re: Probability

well no takers ????

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I love Maths and Music ... dunno which more