- #1
Vector1962
- 61
- 8
- TL;DR Summary
- How to calculate subsets of 4 items from a set of 6 items and only count the subsets that have a specific item.
Hello Forum:
I have numbers 1 through 6 from which i must select 4 items. The twist is that i need to count only those subsets that include the number 2 all of the subsets are 'distinct' --> 2145 is the same as 2415. My quick calculation yields 15 distinct subsets however some of those do not contain the number 2. is there a formula to use or will i have to make some kind of tree diagram to list them? thanks in advance for the help. also, i picked intermediate but it may be a pretty basic question.
I have numbers 1 through 6 from which i must select 4 items. The twist is that i need to count only those subsets that include the number 2 all of the subsets are 'distinct' --> 2145 is the same as 2415. My quick calculation yields 15 distinct subsets however some of those do not contain the number 2. is there a formula to use or will i have to make some kind of tree diagram to list them? thanks in advance for the help. also, i picked intermediate but it may be a pretty basic question.