Answer:
117.
Explanation:
In the country, ABCD are 4 cities.
Roads from city A to city B = 17
Roads from city B to city C = 5
Roads from city A to city D = 4
Roads from city D to city C = 8
We need to find the number of ways from city A to city C.
Route 1 : A-B-C
Total number of ways from A to B = C(17,1) = 17
Total number of ways from B to C = C(5,1) = 5
Total possible number of ways from A to C by route 1 is
A-B-C = 17 × 5 = 85
Route 2: A-D-C
Total number of ways from A to D = C(4,1) = 4
Total number of ways from D to C = C(8,1) = 8
Total possible number of ways from A to C by route 2 is
A-D-C = 4 × 8 = 32
Total ways to drive from city A to city C is
Therefore, the required number of ways is 117.