Q 27. Routes and Networks
A, B and C are three places such that there are three different roads from A to B, four different roads from B to C and three different roads from A to C. In how many different ways can one travel from A to C using these roads?
a)
10
b)
13
c)
15
d)
36
Answer:
c
Two ways to move from A to C –
1. Directly from A to C – 3 ways
2. From A to B and then B to C = 3 × 4 = 12.
So, total number of ways = 15 ways.
Q 34. Routes and Networks
There are four routes to travel from city A to city B and six routes from city B to city C. How many routes are possible to travel from the city A to city C?
a)
24
b)
12
c)
10
d)
8
Answer:
a
Simple arithmetic. For everyone route, you will
have six routes to take. So, total number of routes is 6 X 4 = 24
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