P(n,r)=n!(n−r)!cap P open paren n comma r close paren equals the fraction with numerator n exclamation mark and denominator open paren n minus r close paren exclamation mark end-fraction Key Concepts in Lesson 6
How many ways can 5 students sit in a row of 5 desks? lesson 6 homework practice permutations answers
Arranging 5 distinct books in order. [ P(5,5) = 5! = 5 \times 4 \times 3 \times 2 \times 1 = 120 ] Answer: 120 ways. P(n,r)=n