سلآآم ياجماعه
انا وقفت عند كم سؤال
ابغى حلهم ازا سمحتو ^^"
16. If the letters A,B,C,D,E, and F are to be used in a letter code consists of six digits,
how many different codes are possible if the first letter must be A and repetitions are
not permitted?
A) 720
B) 1440
C) 46656
D) 120