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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.

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.

one year ago

Answers : (3)

Vikas TU
14149 Points
							
Dear student 
If it is not specified , you should assume it as identical ball. 
Hope this will help
Good Luck 
Cheers 
one year 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.
one year ago
Vikas TU
14149 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 
one year ago
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