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There are three boxes with the following...

There are three boxes with the following composition: Box1- 5 red+7white+6blue balls box 2- 4 red+8 white+6blue balls box 3- 3 red+4 white+2blue balls If one ball is drawn at random, then what is the probability that they would be of same colour?

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probability when they are of same color=`5/18xx4/18xx3/9+7/18xx8/18xx4/9xx+6/18xx6/18xx2/9=89/729`
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