Which recursive formula can be used to reresent the sequence 2,6,10,14,18 1. a = 0 1 a = a + 4 n n-1 2. a = 2 1 a = a +4 n-1 n 3. a = 2 1 a = a -4 n n-1 4. a = 2 1 a = a +4 n n-1