@Jackyjk yes, 6141381611 is the correct answer for the random test inputs in the OP

mine : 6141381611
???

integers don't get mutated. (in this case the RNG needed a modification) so, @t1ao: please try your code again

Well that's probably the problem. You should work on a copy and return that leaving the original as it is.

I believe you are mutating the input?

Yes, with spoiler flag pls

The tests seem fine. Are you sure you're reading the logs correctly?

There are more than 19 tests: when you fail the tests are stopped.
Your formulas can be rearranged a little bit so that you don't have or have less rounding errors (have the less possible number of divisions).
Moreover before posting issues you could have a look at https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution.

okay, tell me how this is a issue?

you can post the code later, after correct "markdown formatting"(<- google this) and spoiler flag(that blue flag)