Question

The unit digit of the product $81\times 82\times 83\times 84\times 85\times 86\times 87\times 88\times 89$ is

• A. $0$
• B. $2$
• C. $6$
• D. $8$

Answer 1

The correct option is A $0$

Unit digit of the product $1\times 2\times 3\times 4\times \times 5\times 6\times 7\times 8\times 9$ is $0$.

Hence, the unit digit of the product $81\times 82\times 83\times 84\times 85\times 86\times 87\times 88\times 98$ is also $0$.