Each ball has three different ways to go to a box , to box A or B or C , so total no. of ways are 312
Now we have to find the favorable events , choose 3 balls in 12C3 ways and give it to box A , now remaining 9 balls have only two choices box B or C so they can be filled in 29 ways so total fav ways are 12C3*29
Probability 12C3*29/312
"All of us are God's creatures... just some are more creature than others."
Moderation Team
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