Recursive & Explicit Definitions Which sequence could be described by the explicit definition: = 2.-3 a) - 1, 1, 3, 5, 7, ......} b) {1, 2, 3, 4, 5, 6, ......} c) (5, 7, 11, 19, 35........} d) {1, -1, -5, - 13......}