Counting and Combinatorics

3 selectedDifficulty 2-43 unseenView topic

Saved practice

Keep this quiz in your learner record

Answers count toward your profile, review queue, and next-topic suggestions. You can also use the quick practice below.

FoundationNew

0 answered

2 foundation1 intermediateAdapts to your performance

Question 1 of 3

120sfoundation (2/10)compute

(k n) counts the number of ways to choose k items from n distinct items. Which identity is correct?