How many ways are there to put 4 balls in 3 boxes if two balls are indistinguishably green, two are indistinguishably red, and the boxes are distinguishable?
+100 you can see the answer here: https://web2.0calc.com/questions/how-many-ways-are-there-to-put-4-balls-in-3-boxes_2
read the one with the most thumbs ups
