Arun
Last Activity: 7 Years ago
Here,The word unlimited is just for confusion....there are 10 red balls,10 white balls,10 blue balls out of which we need to select 10 in all possible ways so that W+R+B less than or equal to 10,so that w+r+b+t=10,required ways 10+4-1 c 4-1 = 286.