Algerba Help:

https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.390865.html#:~:text=That%20means%20there%20are%20a%20total%20of%2090000,5%20digit%20numbers%20with%20at%20least%20one%20zero.

Gmatclub:

https://gmatclub.com/forum/how-many-5-digit-numbers-have-at-least-one-zero-digit-411268.html

Same question.

Overview:

(9*10*10*10*10)-9^5= 30951

Total 5 digit numbers-5 digit numbers without a 0=5 digit numbers with a 0

Answer is** 30951**