Probability
Aptitude

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Q.

A box contains 9 red toys, 7 green toys and 9 blue toys. Each ball is of a different size. The probability that the red ball being selected is the smallest red toy, is:

 A.

1/9

 B.

2/21

 C.

1/25

 D.

6/25

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Solution:
Option(A) is correct

Since, there are 9 red toys and all of them are of different sizes, the probability of choosing the smallest among them is 1/9


(4) Comment(s)


Minu
 ()

since selection being done is among the red toys only, thus total arrangements among them 9! if we decide to arrange toys according to the size, similarly no of arrangements when smallest toy is known among the red toys will be 8! ,

8!/9!

hence 1/9



Anu
 ()

Hi answer should be 1/25 since , first probability of selection 9 red balls from 25 balls should be taken and then probability of selection of smallest red ball i.e (9/25 )*(1/9) = 1/25 .

Admin Please correct .



Pakodi
 ()

Hey gagan,

He said "red ball being selected" in question. I think 1/9 is the right answer.



Gagan
 ()

Answer should be 1/25

Because we need to select one ball randomly

It can be red,green,blue.