hi ppl
i think the answer for the bombay dabbawala question is Six Sigma process.

hi

for the case(2 2 0 0 0 ) i mean you have put 4 different ball in 5 boxes
and here there are 2 groups so wont the number of ways for this be 4!/(2!*2!)
please correct me if i am wrong

and for the case where u have similar ball to be put in different boxes we can use the formulae (n+r-1)Cr right and in this case n is the number of boxes and r is the number of balls, but whereas u have used (n+r-1)C(r-1) where i think you have taken the number of balls to be n and the number of boxes to be r.
which formulae is right?
the first one or the second one...
please dont get confused..
lest take an example of 7 similar ball to be put in 3 different boxes
as per the formulae (n+r-1)Cr we have r=7 and n=3
so we get 9C7 and whereas your formulae that is(n+r-1)C(r-1) we have r=3 and n=7 we get 9C2.and both have the same value as 9C7 =9C2
i saw the formulae (n+r-1)Cr for this case in an IIT maths text book
Are both the formule the one and the same....do they give the same answer whn tried for different combinations..

also tell if there is a direct formulae or something for the case when different balls
have to be put in similar boxes other than the method you have done..

also tell me when 7 different balls are put in to 3 different boxes
is the number of ways 3^7 or
is it 9!/(2!)

thanks in advance

hi vinayak
is the formulae for the following
The number of positive integral solution(natural number) for
x1+x2+x3+.........xr=n is (n-1) C (r-1) or (n-r+1)C(r-1)

.Can someone help me out with the following problems with some clear and simple approcah to these qustions


4 balls are to be put in 5 boxes.in how many ways can this be done if
a)Balls are similar and boxes are different
b)balls are different and boxes are similar
c)both boxes and balls are similar
in which of the above cases the formulae (n+r-1)Cr-1 be applied?
is the formulae (n+r-1)Cr or (n+r_1)Cr-1
and which of these formuale is the number of positive integral soultion for
x1+x2+x3+.........xr=n


thanls in advance

Hi
can u tell me the name of the book exactly
that is u said vilinkein naa
that one...
where can i get that in chennai?
plzz tell me the publisher and all stuff in it
is it entirely for probability and permutaions and combinations

hi folks

i need some informations regarding some good books to follow for probability and permutations and combinations. Please mention author name also.
If at all anyone has good documenst that contains good formulae lists for probability and permutaions and combaination stuff .please help me by posting it
thanks in advance
muthu

hi buddy
i am an B.E graduate with 7 months experience.took up CAT 2003.
i am in a dilemma to join which centre to do a course in chennai.you tell TIME is good or wat?