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i did not follow what u said and the correct ans is 505 i forgot to mention and i got it
basically the question says tht atleast 2 didigts are identical which is just another way of saying tht at least one digit is repeated therefore the answe is
5^45!
that is the total no of ways no digit repeated
shruti290Quote 
but where is the case where 2 colors will be missing?
what i thought was tht first there are 90c10 ways in total now
case1draw 10 balls from the 30 red and 30 white balls tht means 60c10
cse 2 10 balls drawn frm 30 white and 30 blue balls tht means 60c10
case310 balls frm 30 red and 30 blue tht emans 60c10
now in all these 3 cases will also involve the cases where only red ,blue or white balss are drawn therefore to avoid double counting we subtract 3*30c10
threfore my answer becomes
3(60c1030c10)/90c10
shruti290Quote 
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