Quiz 15 (Section 9.1) Section 9.1: 1. Consider the sequence: a, = (1)ngn-1 4n+1 ,n 20. a) Write out the first five terms of the sequence. b) Is this sequence arithmetic, geometric or neither? Explain. 2. Consider the sequence: a, = 10 and an+ 1 = an + 2 for n 2 1. a) Write out the first five terms of this sequence. b) Is this sequence arithmetic, geometric, or neither? Explain c) Find an explicit formula for an. 3. For an explicit formula for the sequence: 1, - 2 4 8 16 13' 17 ' * *Quiz 16 (Section 9.2, 9.4) Section 9.2: 1. Find the sum: ( K 2 - 1) 2. Find the sum: 49 ( 3k - 5) 1=0 3. Write as a fraction: 0. 31Section 9.4: 4. Use Pascal's Triangle to expand: (x - Zy) 5. Find the coefficient of x in the expansion: (x + 1)10