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Grade: 12

                        

In a bag there are 5 red balls, 3 white balls and 4 black balls. Four balls are drawn from the bag. Find the number of ways of in which at most 3 red balls are selected. -> I would like to know should we assume 5 red ball are identical or different? As this is not explicitly specified in this question. Please suggest.

8 months ago

Answers : (3)

Vikas TU
12119 Points
							
Dear student 
If it is not specified , you should assume it as identical ball. 
Hope this will help
Good Luck 
Cheers 
8 months ago
Rakhi Jain
25 Points
							
Thanks you sir.
This question appeared in this year JEE mains(8th JAn morning shift).
If we assume all 5 red balls are identical. Likewise all 3 white balls are identical and so for black ball.
Answer should be = 12.
However, if we dont assume balls to be identical, answer would be 490. Which is given as correct answer as per JEE mains site answer key. 
 
I am confused should I challenge this question. Please suggest.
8 months ago
Vikas TU
12119 Points
							
Dear Rakhi 
Consult your teacher , 
I think yu should challenge . 
Because nothing is mentioned in the question , 
And you have right to know proper explanation about questions.
Good Luck 
8 months ago
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