Question

What will be the unit digit
of product of square of first 9
natural numbers?
*

Answer 1

Answer: 0

Step-by-step explanation:

The first 9 natural numbers include 2 and 5.

2² × 5² = 4 × 25 = 100

Let the product of the rest of the digits be n.
We know that 100 × n will always end with 0 at the units place of the digit.

So the unit digit will always be 0.

Note :- I hope this isn't a question from your school/academy test.