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On the railway from station a to station B, there are five stations. How many different fares do you need for the train from station a to station B? How many different tickets do you need to prepare?
There are seven stations
A -1 -2 -3 -4 -5 B
There are 4 kinds of tickets: hard seat, soft seat, hard sleeper and soft sleeper
Tickets for
Station a sells A-1 A-2 A-3 A-4 a-5 A-B X4 tickets
We need to prepare 24 different fares
Four different tickets
I don't know, right
13. There are 25 stations on a certain railway line, so how many different tickets should be prepared for this line? (a.500 b.600 c.400 d.45015. If men and women walk side by side, women's three steps can keep up with men's two steps. How many steps should women take from starting with both right feet to stepping out with both left feet? (a.6 b.8 c.12 D
Let's look at an example first. If there are only three stations, 1 and 2 stations have one kind of ticket, 2 and 3 stations have one kind of ticket, and 1 and 3 stations have one kind of ticket. Therefore, we find that if there are n stations, there should be p (n, 2) kinds of tickets
There are four stations on the railway line from place a to place B (excluding station a and station B, the distance between each station is different)
List how many different fares to prepare from station a to station B? How many different tickets?
5 + 4 + 3 + 2 + 1 ticket price 2 × (5 + 4 + 3 + 2 + 1) ticket price
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