Question 1137401
.
I just solved this problem under this link


<A HREF=https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.1137241.html>https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.1137241.html</A>


https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.1137241.html


couple of days ago.