Andy would like to bring his camera to a maintenance centre nearby. Figure 1 shows a network of roads from Andy's home (A) to the centre (C). Assume that he can only go either east or north at each junction (such as B).
(a) How many routes from A to C can Andy choose?
(b) Once Andy arrives at a junction, the probability that he goes north is 0.3.
(i) Find the probability that Andy will arrive at C.
(ii) Find the probability that Andy will arrive at C without passing the junction B.

@dan815

Question

Andy would like to bring his camera to a maintenance centre nearby. Figure 1 shows a network of roads from Andy's home (A) to the centre (C). Assume that he can only go either east or north at each junction (such as B).
(a) How many routes from A to C can Andy choose?
(b) Once Andy arrives at a junction, the probability that he goes north is 0.3.
(i) Find the probability that Andy will arrive at C.
(ii) Find the probability that Andy will arrive at C without passing the junction B.

@dan815

anonymous · Answer

|dw:1418023534763:dw|