James Bond has to crack a password of 3 symbols. The symbols can be +, − or ×. Every time, he makes an attempt to crack the password, a feedback is given in the form of ‘R’ and ‘W’. ‘R’ indicates that one of the symbols is in the right place. ‘W’ indicates that one of the digits is in the wrong position. All the codes are used.
This is his first two attempts with their respective feedbacks:
What is the minimum number of additional attempts required to crack the code?