How many ways are there to distribute 6 distinguishable objects into 4 indistinguishable boxes so that each of the boxes contain at least 1 object?
Can anyone tell me how should I approach this question? I'm kinda stuck :(
I'm quite bad at questions involving placing indistinguishable objects into distinguishable boxes/ distinguishable objects into indistinguishable boxes and etc. Any tips on how to approach this kind of questions?