Question

How many ways 10 identical balls are to be dropped into 3 numbered boxes such that every box has at least 2 balls?

Answer 1

there are 10 identical balls and 3 numbered boxes ( that means they aren't identical) .
Every box has at least 2 balls So, first give 2 balls to all the three boxes .

Now, there are 4 balls left and 3 boxes and we can now give any no. of balls to any box .

Hence , the no. of ways of doing it is 3^4 = 81.

hope u got it .... ☺ :)

Answer 2

1st of fall drop to 2 balls in each box.then u will find remaining balls.now start placing each ball in each box. so that the balls will complete and each ball has at least 2 balls