Question

what will be the unit digit of product of square of first 9 natural number 1)0
2)1 3)6 4)4​

Answer 1

3) 6

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if You Take Squares from 1 to 20, How Many of Them Will be Even Numbers? The even numbers between 1 to 20 are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20. Since the squares of even numbers are always even. Therefore, the value of squares of numbers 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 will be even.

x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 = ?

1 x 2 = 2

2 x 3 = 6

6 x 4 = 24

24 x 5 =120

120 x 6 =720

720 x 7 = 5040

5040 x 8 = 40320

40320 x 9= 362880

So the product of all natural numbers till 9 is 362880

And thus we can see that the digit at the unit's place is 0.

So the answer is 0