Hello,

I’m sorry for this but i can’t figure out with the formula to calculate permutation, as i can find which case is.

Can someone explain this in order to think to a method for coding?

No repeats please - Formula

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Hello,

I’m sorry for this but i can’t figure out with the formula to calculate permutation, as i can find which case is.

Can someone explain this in order to think to a method for coding?

Never had permutations in math?

https://en.wikipedia.org/wiki/Permutation#Other_uses_of_the_term_permutation

yes, but i was trying to solve some cases in order to find if my thought was right.

For example in the set [aabb] i solved with result 6 , instead in the program if i run to test the result it return 8. I can’t understand why…

because every letter is unique so you have for aabb:

a1 b1 a2 b2

a1 b2 a2 b1

a2 b1 a1 b2

a2 b2 a1 b1

b1 a1 b2 a2

b1 a2 b2 a1

b2 a1 b1 a2

b2 a2 b1 a1

Yes, i can do it by hand but which formula? permutation with repetition or without. Because i can retrieve this result with any of the formula.