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Blog Entry# 5826575
Posted: Sep 20 2023 (19:36)

2 Responses
Last Response: Sep 20 2023 (20:13)
Rail Fanning
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Sep 20 2023 (19:36)  
PrakharYadav^~
PrakharYadav^~   12860 blog posts
Entry# 5826575               Past Edits
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FUN QUESTION FOR RAIL ENTHUSIASTS
Students who are pursing or have pursued mathematics as a subject in school and college or even competitive exam aspirants.

Indian Railways assigns station code to each of its railway station. Each station code comprises of English alphabets with length 1, 2, 3 and 4.
e.g.
...
more...
A, BB, XYZ and PQRS.
What are the maximum railway stations possible with 1 alphabet, 2 alphabets, 3 alphabets, 4 alphabets and all in total ?

EDIT
NOTE : Alphabets can be repeated.

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Sep 20 2023 (19:59)
Magahi~
Magahi~   548 blog posts
Re# 5826575-1               Past Edits
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For 1 letter it would be 26 combination
For 2 letter it would be 650 combination
For 3 letter it would be 15600 combination
For 4 letter it would be 358800 combination
( this all
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more...
combination if letter are not repeated)
If letter can repeated than simply
For 1 letter it would be 26 combination
For 2 letter it would be 26×26 combination
For 3 letter it would be 26×26×26 combination
For 4 letter it would be 26×26×26×26 combination

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Sep 20 2023 (20:13)
Mridul^~
Mridul^~   46710 blog posts
Re# 5826575-2              
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For 1 letter, answer is 26 in both cases.

For 2 letters, answer is 650 with letter not being repeated for repeating answer is 676.

For 3 letters, answer is 15600 with letter
...
more...
not being repeated and for repeating answer is 17576.

For 4 letters, answer is 358800 with letter not being repeated and for repeating answer is 456976.

So total answer is with repeating 475254 and without repeating 375026

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