Question 973247
1/3, then -1/9, then 1/27, and so on.

Each number in the sequence is -1/3 of the previous number. 27/-3 = -9 ; -9/-3 = 3; 3/-3 = -1; and -1/3 = -1/3.

Don't forget that a negative divided by a negative will yield a positive number, whereas a positive number divided by a negative number will yield a negative number.