Prove that (:- En for al integers n2 1. To prove the identity, first prove = n. Start with the left side of the equation and solve for the right side. n! = 1!(n - 1)! Apply the combination counting formula. n(n - 1)(n - 2)! (n - 1)(n - 2)! n(n - 1)! 1 (n - 1) ! (n - 1)! 1n(n - 1)