# Combination

There are 3 doors to a lecture room. In how many ways can a lecturer enter and leave the room?

(A) 1

(B) 3

(C) 6

(D) 9

(E) 12

There are 3 doors to a lecture room. In how many ways can a lecturer enter and leave the room?
(A) 1
(B) 3
(C) 6
(D) 9
(E) 12

rammsah30@a2plcpnl0464.prod.iad2.secureserver.netAdministratorSOLVE - ΜΔΓΗŠ
D

D. 9

3 ways to enter, 3 ways to leave. So total 9 ways since both are independent

(D)