Stuck with a quants question from Foundation Quiz

[anj.tapadiya]

Can someone help me out with this? I tried using the method explained in one of the videos of trying to find # of numbers in factorials.

Got the question from here: -

GRE Quant Foundation Assessment Test (Arithmetic)

[Leaderboard]

This is not a “PowerPrep+” question - fixed title

Also see

How to Ask Better GRE Questions on Forums

Since GregMat (who is a very chill person) doesn’t have any specific formatting rules when it comes to asking questions on the forums, I feel like there should at least be a reference text of some sort that can help people ask better questions and make the process more enjoyable for those who try to answer them. The Golden Rule: Imagine You’re Trying To Answer the Question Before you post your question about GRE preparation, practice questions, or strategies, try to put yourself in the shoes of…

In other words, expand the approach you took.