Question

What is the digit at unit place in the procluct of first 9 natural numbers​

Answer 1

Answer:

9*8*7*6*5*4*3*2*1.

No matter how many odd numbers, the introduction of an even number into the room will produce an even digit at the end of the number.

And the 5 there will take that even digit and give a 0 at the unit’s place.

So, no matter what, the product of any number of the first natural numbers (above 4) will give a 0 at the unit’s place.

Hope it’s clear