finding the last non-zero digit?

Question

someone said,

(4^n)*2n! this is the formula for finding the last non-zero digit .

i don't understand whats n here .

it was told that we can use this formula to find last non-zero digit of 10!

can we do it really ?

How ?

i don't understand the terms involved in that formula hence not able to implement.

please help

thanks

Answer 1

You want to know the last non-zero digit in a specific factorial

I'm not sure where your formula came from. I too can't get it to line up with the numbers exactly.

If you want to calculate the final least significant (non-zero) digit in a specific factorial, I suggest you read the links below for more details.

Answer 2

Someone is feeding you a paradigm joke, there is nothing complicated here, it's just simple 9, since the answer must be '1' digit. Who needs a freaky formula for that? jeezzz