Latest Elitmus Aptitude Question SOLUTION: There is an unlimited stock of blue, red, white, and grey coloured balls. What is the number of ways of selecting 12 balls from the stocks? Request

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(#M40157517) ELITMUS Numerical Ability question Keep an EYE

There is an unlimited stock of blue, red, white, and grey coloured balls. What is the number of ways of selecting 12 balls from the stocks? Request

Asked In Elitmus Srivithya (7 years ago)

Unsolved Read Solution (5)

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Read Solution (5) :

Anirudh Singh Negi  (7 years ago)

Let us say that we have selected 'x1' blue balls, 'x2' red balls, 'x3' white balls and 'x4' grey coloured balls.
This means, x1+x2+x3+x4 = 12
Now, for an intance, 1+2+3+6 can be an answer. 0+0+0+12 can also be another answer
Hence, we need to find the non-negative integral solution for the equation
x1+x2+x3+x4 = n is

(n+k-1)C(k-1)
Here, n=12 and k=4
(12+4-1)C(4-1) = 15C3 = 455

Is this solution Helpfull? Yes (13) | No (5)  

Bharath Rudroju  (7 years ago)

how it can be define as mentioned above unlimited stock

Is this solution Helpfull? Yes (1) | No (3)  

atul patel  (7 years ago)

lets
b->blue
r->red
w->white
and
g->grey
so according to question----
b+r+w+g=12 and there will required 3 partition of 12.......so total=12+3
15! /(12! x 3!)
=455 ans

Is this solution Helpfull? Yes (1) | No (3)  

Vivek  (5 years ago)

As we have to select blue,red,white,grey balls from unlimited no of stocks

now,for selecting 1st ball we have 4 ways(i.e it can be of blue,red,white,grey),similarly for aal 11 balls
so ans is
= 4*4*4*4*4*4*4*4*4*4*4*4

Is this solution Helpfull? Yes (1) | No   

rahul kumar  (6 years ago)

12C4 out of 12 ball 4 ball can be selected

Is this solution Helpfull? Yes | No   

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