Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. A B Z _ P A B _ K P A B X K _ A B _ K P

A C B Z A Y Z W K Y P W K C Z W

K Y P W

A B Z K P / A B Y K P / A B X K P / A B W K P In this question 1 is subtracted from the third letter,  Z-1 = Y; Y-1 = X; X-1 = W K Y P W