Question

The digit in unit's place of the product $81\times 82\times 83\times .........\times 89$ is

• A. 1
• B. 0
• C. 2
• D. 3

Answer 1

The correct option is A 1

Solution :

The last digit of the no. $81\times 82\times 83\times ...\times 89$ is

same as last digit of $1\times 2\times 3\times ...\times 9$

which is $0$.

$\therefore$ The units place of the product $81\times 82\times 83\times ...\times 89$

is $0$