On a railway route there are 20 stations...

On a railway route there are 20 stations. What is the number of different tickets required in order that it may be possible to travel from every station to every other station

A

40

B

380

C

400

D

420

Text Solution

Verified by Experts

The correct Answer is:

B

Topper's Solved these Questions

PERMUTATION AND COMBINATION
PUNEET DOGRA|Exercise PREV YEAR QUESTIONS|50 Videos
MATRIX
PUNEET DOGRA|Exercise PREV YEAR QUESTIONS|91 Videos
POINT & LINE
PUNEET DOGRA|Exercise PREV YEAR QUESTIONS |105 Videos

Similar Questions

Explore conceptually related problems

On a railway there are 20 stations.The number of different tickets required in order that it may be possible to travel from every station to every station is

On a raiway there are 10 stations. The number of types of tickets required in order that it may be possible to book a passenger from every staton to every other is

There are 10 railway stations between a station X and another station Y. Find the number of different tickets that must be printed so as to enable a passenger to travel from one station to any other.

There are five stations on a railway line. What is the number of different journey tickets that are required for railway authorities?

There are 50 stations on a railway line.The number of different kinds of single 2 nd class tickets must be printed so as to enable a passenger to travel from one station to another station is:

In a network of railways,a small island has 15 stations.Find the number of different types of tickets to be printed for each class,if every stations must have tickets for other stations.

There are 15 stations on a certain railway line. How many different types of tickets must be printed so that a passenger can travel from any station to another in that line?

There are n stations on a railway line. The number of kinds of tickets printed (no return tickets) is 105. Find the number of stations

There are 15 stations from New Delhi to Mumbai. How many first class tickets can be printed to travel from one station to any other station?

PUNEET DOGRA-PERMUTATION AND COMBINATION-PREV YEAR QUESTIONS

On a railway route there are 20 stations. What is the number of differ...
Text Solution
|
If .^(n)P(r)= 2520 and .^(n)C(r)= 21, then what is the value of .^(n+...
Text Solution
|
What is C( 47,4) + C ( 51,3) + C ( 50,3) + C ( 49,3) + C ( 48,3) + C ...
Text Solution
|
How many 3-digit numbers can be formed from the digits 1,2,3,4 and 5 a...
Text Solution
|
From 6 programmers and 4 typists, an office wants to recruit 5 people....
Text Solution
|
There are 10 points in a plane. No three of these points are in a stra...
Text Solution
|
Three dice having digits 1,2,3,4,5 and 6 on their faces are marked . I...
Text Solution
|
What is the sum of all three-digit numbers that can be formed using al...
Text Solution
|
The total number of 5-digit numbers that can be composed of distinct d...
Text Solution
|
There are 17 cricket players, out of which 5 players can bowl. In how ...
Text Solution
|
What is the number of triangles that can be formed be choosing the ver...
Text Solution
|
How many four-digit numbers divisible by 10 can be formed using 1,5,0,...
Text Solution
|
How many numbers between 100 an 1000 can be formed with the digits 5,6...
Text Solution
|
A tea party is arranged for 16 people along two sides of a large table...
Text Solution
|
How many new words are possible from the letters of the word PERMUTATI...
Text Solution
|
How many words beginning with vowels can be formed with the letters of...
Text Solution
|
What is the number of odd integers between 1000 and 9999 with no digit...
Text Solution
|
A five digits number divisible by 3 is to be formed using the number 0...
Text Solution
|
Out of 15 points in a plane, n points are in the same straight line. 4...
Text Solution
|
What is the number of different messages that can be represented by th...
Text Solution
|
What is the number of four-digit decimal numbers ( lt 1) in which no d...
Text Solution
|