Question

The product of successor and predecessor of $1001$ is

• A. $100200$
• B. $1002000$
• C. $111000$
• D. $101000$

Answer 1

The correct option is B $1002000$

Successor of $1001\text{is}=1002\cdots \left(i\right)$
Predecessor of $1001\text{is}=1000\cdots \left(ii\right)$
Mutiplying $\left(i\right)\text{and}\left(ii\right)$
Product $=1002\times 1000=1002000$