Why the result was "none"

Question

#SOLVED #SOLVED
https://code.sololearn.com/cAgL15zZbwxk/?ref=app

Answer 1

The output was None because append or extend does not return a value but None, which then is printed. BTW, what total number of combinations you have calculated?

Answer 2

I don't think that this is correct, must be much more. Here are 2 webpages that might help you:

(1) permutation calculator: ( does not support multiple sets of objects
https://www.calculatorsoup.com/calculators/discretemathematics/permutationsreplacement.php

(2) explanation of the calculationd
https://socratic.org/questions/license-plates-are-made-using-3-letters-followed-by-2-digits-how-many-plates-can

Answer 3

i guess i successfully solved this question.but my code wasn't the compatible.because i need to fix/ increase variable data while question getting larger.However idk why my output was "none"

Answer 4

im just trying doing my homework using programming , its kinda hard to understand my messy code.😂

Answer 5

i got a typo in comment of code, 4 letter , not 5 , shouldnt the formula 4P3 x 3P2 would be correct? 🤔
The references you provided contain the formula counted repeat letter/digits e.g : (b,b),(3,3).

Answer 6

Lothar i guess is 24x6 which is 144?