Question

20.
What is the last non zero digit in 25!?
(a) 9
(6) 4
(c) 2
(d) 1​

Answer 1

Here, [ ] is the greatest integer function.

This is the quickest method I've come across. You can find the last non zero digit of any factorial using the above formula. The example of 28 is shown above.

For 25 , we will get

LNZD ( 25! ) =LNZD ( 5! ) × last digit of 25 × 0!

= 2 × 2 × 1

= 4

That was a good question

((Mark me as a Brainliest pleeeeease))