Chapter 9 - Infinite Series - 9.1 Sequences - Exercises Set 9.1 - Page 605: 4

a) (2n)! b) (2n-1)!

a) 2 , 4 , 6 ... Tn = a + (n-1)d where a = 2, d = 2 Tn = 2 + (n-1)2 Tn = 2n The general term is (2n)! b) 1 , 3 , 5 , 7 ... If we observe the previous series with this one, each new term is one less than twice the term. The general term is (2n-1)!