1. Write down the first five terms of the sequence. (Sn) = (5n) Type the first five terms of the sequence (Sn) = (5n). Assume n greater or equal to 1. S1 = S2 = S3 = S4 = S5 = Simplify your answers 2. The given pattern continues. Write down the nth term of the sequence suggested by the pattern. 1, 1/4, 1/16, 1/64, ... Type the nth term of the sequence. an= 3. Find the nth term of the arithmetic sequence {an} whose initial term a and common differenced are given. What is the fifty-first term? a, = - 1; d=4 an= a51= (Simplify your answer.)