10% A. Find the indicated sum of each geometric series Mras ane se 1. a,= 1, a= 1 1024 2. a, = -1, a,o= 512, r=-2; S,10 A 3. x+ 2x? + 4x + 4. xy + xy° + xy° +.. S. B. Find the specified value using the given information about the gaomem 1.r=2 S。=2044 ; a, 2. r=3 S,= 121; 0。 3. r=, S,=31, 0,= 16; n