Can someone please help me out with this problem?

how many different combinations are there of 12 things, four of which are alike, if five are taken at a time?

I approached this question by calculating the possibilities with no restrictions, then dividing the 4 repeated items. I got (12C5)/4!...

how many different combinations are there of 12 things, four of which are alike, if five are taken at a time?

I approached this question by calculating the possibilities with no restrictions, then dividing the 4 repeated items. I got (12C5)/4!...

Last edited: